Hi i have a slight problem adjusting my bed via meshbedleveling. Out of some strange behavior my G29 responds with a highmap some 5 or 6mm too deep. Mean deviation is acceptable, but i don't now if this works for printing in Case of compensating.
Here is a picture of the highmap:

Here is my config:
; Configuration file for Duet 3 (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Fri Mar 12 2021 17:14:12 GMT+0100 (Mitteleuropäische Normalzeit)
; General preferences
G4 S1
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"ToolChanger" ; set printer name
M669 K1 ; select CoreXY mode
; Network
M552 P192.168.178.111 S1 ; enable network and acquire dynamic address via DHCP
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet
; Drives
M569 P0.0 S1 ; physical drive 0.0 goes forwards Drive 0 X
M569 P0.1 S1 ; physical drive 0.1 goes forwards Drive 1 Y
M569 P0.2 S1 ; physical drive 0.2 goes forwards Drive 2 Z
M569 P121.0 S1 ; physical drive 121.0 goes forwards Drive Toolboard 121 E0
M569 P122.0 S1 ; physical drive 122.0 goes forwards Drive Toolboard 120 E1
M569 P0.3 S0 ; physical drive 0.3 goes forwards Drive 3 E2
M569 P0.4 S0 ; physical drive 0.4 goes forwards Drive 4 E3
M569 P0.5 S0 ; physical drive 0.5 goes forwards Drive 5 Coupler
M584 X0.0 Y0.1 Z0.2 C0.5 E121.0:122.0:0.3:0.4 ; set drive mapping
M350 C8 I0 ; configure microstepping without interpolation
M350 X16 Y16 Z16 E16:16:16:16 I1 ; configure microstepping with interpolation
M92 X80.14 Y80.14 Z1600.00 C100 E417.10:417.10:466.793:466.793 ; set steps per mm
M566 X400 Y400 Z8.00 C2 E40:40:6000:6000 ; set maximum instantaneous speed changes (mm/min)
M203 X35000 Y35000 Z1200 C5000 E6000:6000:6000:6000 ; set maximum speeds (mm/min)
M201 X6000.00 Y6000.00 Z400.00 C400 E1200.00:1200.00:6500.00:6500.00 ; set accelerations (mm/s^2)
M906 X1800 Y1800 Z1330 C400 E1200:1200:1200:1200 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S120 ; Set idle timeout
;Stall Detection
M915 C S5 F0 H200 ; Coupler
;Stall Detection
M915 X Y S4 F0 H400 ; X / Y Axes
; Axis Limits
M208 X-56.5 Y-57.5 Z-6 C0 S1 ; set axis minima
M208 X353.5 Y360 Z308 C260 S0 ; set axis maxima
; Endstops
M574 X1 S3 ; configure sensorless endstop for low end on X
M574 Y1 S3 ; configure sensorless endstop for low end on Y
M574 Z1 S2 ; configure active-high endstop for low end on Z via pin io2.in
; Z-Probe
;M558 P1 R1 C"!io3.in" H10 F2400 A4 S0.05 T6000 ; set Z probe type to effector and the dive height + speeds NORMALERWEISE S0.03
M558 P1 R1.0 C"!io3.in" H7 F500 T10000 ; set Z probe type to effector and the dive height + speeds
G31 P500 X0 Y0 Z0 ; set Z probe trigger value, offset and trigger height
M557 X5:295 Y5:295 S40 ; define mesh grid
; Heaters
;Bed
M308 S0 P"temp0" Y"pt1000" ; configure sensor 0 as PT1000 on pin temp0
M950 H0 C"out0" T0 ; create bed heater output on out0 and map it to sensor 0
M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S125 ; set temperature limit for heater 0 to 125C
;Extruder 0
M308 S1 P"121.temp0" Y"pt1000" ; configure sensor 1 as PT1000 on pin 121.temp0
M950 H1 C"121.out0" T1 ; create nozzle heater output on 121.out0 and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S350 ; set temperature limit for heater 1 to 350C
;Extruder 1
M308 S2 P"122.temp0" Y"pt1000" ; configure sensor 2 as PT1000 on pin 122.temp0
M950 H2 C"122.out0" T2 ; create nozzle heater output on 122.out0 and map it to sensor 2
M307 H2 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H2 S350 ; set temperature limit for heater 2 to 350C
;Extruder 2
M308 S3 P"spi.cs0" Y"rtd-max31865" ; configure sensor 3 as thermocouple via CS pin spi.cs0
M950 H3 C"out1" T3 ; create nozzle heater output on out1 and map it to sensor 3
M307 H3 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H3 S350 ; set temperature limit for heater 3 to 350C
;Extruder 3
M308 S4 P"spi.cs1" Y"rtd-max31865" ; configure sensor 4 as thermocouple via CS pin spi.cs1
M950 H4 C"out2" T4 ; create nozzle heater output on out2 and map it to sensor 4
M307 H4 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H4 S350 ; set temperature limit for heater 4 to 350C
; Fans
M950 F0 C"121.out2+out2.tach" Q2500 ; create fan 0 on pin 121.out1 and set its frequency
M106 P0 C"Tool 1 Lüfter" S1 H1 T45 ; set fan 0 name and value. Thermostatic control is turned on
M950 F1 C"122.out2+out2.tach" Q2500 ; create fan 1 on pin 121.out2 and set its frequency
M106 P1 C"Tool 2 Lüfter" S1 H2 T45 ; set fan 1 name and value. Thermostatic control is turned on
M950 F2 C"out9" Q500 ; create fan 2 on pin out7 and set its frequency
M106 P2 C"Bauteilkühlung 1" S0 H-1 ; set fan 2 name and value. Thermostatic control is turned off
M950 F3 C"out5+out5.tach" Q500 ; create fan 3 on pin out8 and set its frequency
M106 P3 C"Bauteilkühlung 2" S0 H-1 ; set fan 3 name and value. Thermostatic control is turned off
M950 F4 C"out8" Q2500 ; create fan 4 on pin out9 and set its frequency
M106 P4 C"Tool 3 Lüfter" S1 H3 T45 ; set fan 4 name and value. Thermostatic control is turned on
M950 F5 C"out7" Q2500 ; create fan 5 on pin out4 and set its frequency
M106 P5 C"Tool 4 Lüfter" S1 H4 T45 ; set fan 5 name and value. Thermostatic control is turned on
M950 F6 C"out4+out4.tach" Q25000 ; create fan 5 on pin out5 and set its frequency
M106 P6 C"Boardkühlung 1" S1 H1:2:3:4 T45 ; set fan 6 name and value. Thermostatic control is turned on
M950 F7 C"!out6+out6.tach" Q25000 ; create fan 6 on pin out6 and set its frequency
M106 P7 C"Gehäusekühlung" S1 H1:2:3:4 T45 ; set fan 7 name and value. Thermostatic control is turned on
; Tools
M563 P0 D0 H1 F0:2:3 ; define tool 0
G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C
M563 P1 D1 H2 F0:2:3 ; define tool 1
G10 P1 X0 Y0 Z0 ; set tool 1 axis offsets
G10 P1 R0 S0 ; set initial tool 1 active and standby temperatures to 0C
M563 P2 D2 H3 F0:2:3 ; define tool 2
G10 P2 X0 Y0 Z0 ; set tool 2 axis offsets
G10 P2 R0 S0 ; set initial tool 2 active and standby temperatures to 0C
M563 P3 D3 H4 F0:2:3 ; define tool 3
G10 P3 X0 Y0 Z0 ; set tool 3 axis offsets
G10 P3 R0 S0 ; set initial tool 3 active and standby temperatures to 0C
; Custom settings
M593 F50 ; cancel ringing at 50Hz (https://forum.e3d-online.com/threads/accelerometer-and-resonance-measurements-of-the-motion-system.3445/)
M376 H15 ; bed compensation taper
;tool offsets
G10 P0 X19.8 Y58 Z-3.275 ; T0 Hemera 0.5mm Nozzle
G10 P1 X18.8 Y58 Z-3.1 ; T1 Hemera 0.4mm Nozzle
G10 P2 X-9 Y39 Z-3.44 ; T2 E3D V6 Bondtech 0.4mm Nozzle
G10 P3 X-9 Y39 Z-5.39 ; T3 Prometheus Bondtech 0.4mm Nozzle
; Deselect tools
T-1
; Pressure Advance
M572 D0 S0.05 ; pressure advance T0
M572 D1 S0.05 ; pressure advance T1
M572 D2 S0.2 ; pressure advance T2
M572 D3 S0.2 ; pressure advance T3
; Heater model parameters
M307 H0 B0 R0.162 C1661.3 D30.91 S1.00 V24.0
M307 H1 B0 R2.147 C289.1:220.0 D5.22 S1.00 V23.7
M307 H2 B0 R2.322 C197.6:173.7 D5.69 S1.00 V23.6
M307 H3 R1.607 C273.7:225.8 D6.01 S1.00 V23.9
M307 H4 R2.114 C239.508:194.630 D7.77 S1.00 V23.9 B0 I0
; Miscellaneous
M575 P1 S1 B57600 ; enable support for PanelDue
M501 ; load saved parameters from non-volatile memory
M911 S20 R23 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
here is my bed.g:
; Bed Mesh Leveling
G28 Z
G1 S2 Z3 F500 ; lift Z 3mm
;G31 P{sensors.probes[0].value[0] + 15} ;for analog reading of precision Piezo
G29
;disable mesh leveling, needs to be enabled at the start of your print and disabled again when finished.
G29 S2
; Park the head
G1 X-20 Y0 F50000
here is my homeall:
; homeall.g
; called to home all axes
M98 Phomec.g ; Home C (ToolHead)
M98 Phomey.g ; Home Y
M98 Phomex.g ; Home X
M98 Phomez.g ; Home Z
G1 X-20 Y-0 Z5 F15000 ; Park
here is my homec:
; homec.g
; called to home the C axis (coupler)
;crashc
G92 C260
M913 C50 ; C MOTOR TO 40% CURRENT
G1 C-260 F2400 ; drive the C-axis to the stop
M913 C100 ; C MOTOR TO 100% CURRENT
G1 C1 F50000
G92 C0
;Open Coupler
M98 P/macros/Coupler - Unlock
here is my homex:
; homex.g
; called to home the x axis
G91 ; use relative positioning
G1 H2 X0.5 Y-0.5 F10000 ; energise to avaoid false triggers during sensorless homing
M400 ; make sure everything has stopped before we make changes
G4 P100 ; wait 100ms
M913 X30 Y30 ; drop motor currents to 50%
M915 H200 X Y S2 R0 F0 ; set X and Y to sensitivity 3, do nothing when stall, unfiltered
G1 H2 Z3 F5000 ; lift Z 3mm
G1 H1 X-400 F3000 ; move left 400mm, stopping at the endstop
G1 H1 X2 F2000 ; move away from end
G1 H2 Z-3 F1200 ; lower Z
G90 ; back to absolute positioning
M400 ; make sure everything has stopped before we reset the motor currents
G4 P100 ; wait 100ms
M913 X100 Y100 ; motor currents back to 100%
here is my homey:
; homey.g
; called to home the Y axis
G91 ; use relative positioning
G1 H2 X0.5 Y-0.5 F10000 ; energise to avaoid false triggers during sensorless homing
M400 ; make sure everything has stopped before we make changes
G4 P100 ; wait 100ms
M913 X30 Y30 ; drop motor currents to 20%
M915 H200 X Y S2 R0 F0 ; set X and Y to sensitivity 3, do nothing when stall, unfiltered
G1 H2 Z3 F5000 ; lift Z 3mm
G1 H1 Y-400 F3000 ; move to the front 400mm, stopping at the endstop
G1 H1 Y2 F2000 ; move away from end
G1 H2 Z-3 F1200 ; lower Z
G90 ; back to absolute positioning
M400 ; make sure everything has stopped before we reset the motor currents
G4 P100 ; wait 100ms
M913 X100 Y100 ; motor currents back to 100%
here is my homez:
; homez.g
; called to home the Z axis
T-1 ;just in case there is a tool coupled, go try to drop it at the dock
M98 P/macros/Coupler - Unlock ;Open Coupler
G91 ; Relative mode
G1 H2 Z5 F5000 ; Lower the bed
G90 ; back to absolute positioning
G1 X150 Y150 F50000 ; Position the endstop above the bed centre
G91 ; Relative mode
G4 P1000 ; wait 500msec
;G31 P{sensors.probes[0].value[0] + 15}
;G30 ; Probe the bed at the current XY position.
; When the probe is triggered, set the Z coordinate
; to the probe trigger height.
G1 Z-300 H1 F500 ; Move Z down until the switch triggers (first pass)
G4 P100 ; wait 100msec
G1 Z5 F2400 ; Lift Z
G4 P1000 ; wait 100msec
;G31 P{sensors.probes[0].value[0] + 50}
;G30 ; Probe the bed at the current XY position.
; When the probe is triggered, set the Z coordinate
; to the probe trigger height.
G1 Z-300 H1 F500 ; Move Z down until the switch triggers (second pass)
G4 P100 ; wait 100msec
G1 Z5 F5000 ; Drop the Bed
G90 ; Back to absolute positioning
and here is for example my tool0 pre, post and free:
; tfree0.g
; called when tool 0 is freed
;Drop the bed
G91
G1 Z4 F1000
G90
;mesh levelling off
G29 S2
;Purge nozzle
;M98 Ppurge_r.g
;Move In
G53 G1 X320.9 Y280 F50000
G53 G1 Y307 F50000
G53 G1 Y332.5 F5000
;Open Coupler
M98 P/macros/Coupler - Unlock
;fan off
M106 P2 S0
;Move Out
G53 G1 Y280 F50000
; tpost0.g
; called after tool 0 has been selected
;heatup
M116 P0
;prime nozzle
;M98 Pprime_r.g
;mesh levelling on
G29 S1
;PCF fan on
M106 P2 R2
; tpre0.g
; called before tool 0 is selected
;Unlock Coupler
M98 P/macros/Coupler - Unlock
;Move to location
G1 X320.5 Y280 F50000
;Move in
G1 Y307 F50000
;Collect
G1 Y332.5 F2500
;Close Coupler
M98 P/macros/Coupler - Lock
;WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
;if you are using non-standard length hotends ensure the bed is lowered enough BEFORE undocking the tool!
G91
G1 Z10 F1000
G90
;Move Out
G1 Y280 F4000
and last but not least here is my Highmap
RepRapFirmware height map file v2, min error -6.153, max error -5.886, mean -6.000, deviation 0.056
axis0,axis1,min0,max0,min1,max1,radius,spacing0,spacing1,num0,num1
X,Y,5.00,295.00,5.00,295.00,-1.00,40.00,40.00,8,8
-5.919, -5.969, -5.986, -5.986, -5.994, -6.052, -6.036, -5.969
-5.911, -5.952, -5.961, -5.969, -5.986, -6.028, -6.028, -5.961
-5.886, -5.952, -5.969, -5.977, -6.003, -6.028, -6.036, -5.961
-5.894, -5.952, -5.969, -5.986, -5.986, -6.052, -6.036, -5.969
-5.903, -5.961, -5.969, -5.961, -5.994, -6.028, -6.052, -5.977
-5.903, -5.961, -5.969, -5.977, -5.994, -6.061, -6.077, -6.011
-5.944, -6.003, -6.028, -6.011, -6.036, -6.094, -6.111, -6.036
-6.003, -6.044, -6.069, -6.036, -6.077, -6.119, -6.153, -6.102
My Question is, what did i do wrong here?
My printer is a self build toolchanger. Has 4 tools and a build volume of 300mm³.
Thx for the help.