@droftarts it would seem you've hit the nail on the head. I've tried your suggestion and it worked so thank you very much. Problem #1 is dead and gone.

I have adjusted the R value. But my other problems persist

; homedelta.g
; called to home all towers on a delta printer
;
; generated by RepRapFirmware Configuration Tool v2.1.3 on Sun Dec 01 2019 22:19:07 GMT-0700 (Mountain Standard Time)
G91 ; relative positioning

G1 H1 X705 Y705 Z705 F3600 ; move all towers to the high end stopping at the endstops (first pass)
G1 H2 X-5 Y-5 Z-5 F3600 ; go down a few mm
G1 H1 X10 Y10 Z10 F360 ; move all towers up once more (second pass)
G90 ; absolute positioning
G1 X0 Y0 F6000 ; move X+Y to the centre

Recently upgraded to a duet wifi and im having issues with homing and a slight problem with auto calibration. I followed Design Prototype Tests youtube guide to get me up and and running. The printer is a tevo little monster with a genuine bltouch and everything else is stock.

Problem #1. When i home i get the Error: G0/G1: target position not reachable from current position. It homes fine and from what i can tell nothing is wrong but it throws that error every time i home with either a G28 or the home all axis button. I read a post from HarveyS with a similar issue and his solution did not work for me.

My config.g

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"Tevo Little Monster" ; set printer name
M665 R155 L397.19 B155 H525 ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X0 Y0 Z0 ; put your endstop adjustments here, or let auto calibration find them

; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S1 ; enable FTP
M586 P2 S1 ; enable Telnet

; Drives
M569 P0 S1 ; physical drive 0 goes backwards
M569 P1 S1 ; physical drive 1 goes backwards
M569 P2 S1 ; physical drive 2 goes backwards
M569 P3 S0 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z80.00 E403.00 ; set steps per mm
M566 X1200.00 Y1200.00 Z1200.00 E1200.00 ; set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y18000.00 Z18000.00 E1200.00 ; set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z1000.00 E1000.00 ; set accelerations (mm/s^2)
M906 X1000 Y1000 Z1000 E1200 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 Z0 S1 ; set minimum Z

; Endstops
M574 X2 Y2 Z2 S1 ; Define active high microswitches
M558 P1 X0 Y0 Z0 H5 F120 T6000 ; Set Z probe type to unmodulated, the axes for which it is used and the probe + travel speeds
M557 R130 S20 ; Define mesh grid

; Z-Probe
M307 H3 A-1 C-1 D-1 ; disable heater on PWM channel for BLTouch
M558 P9 H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X0 Y20 Z1.627 ; set Z probe trigger value, offset and trigger height
M557 R150 S45 ; define mesh grid

; Heaters
M305 P0 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 0
M143 H0 S80 ; set temperature limit for heater 0 to 80C
M305 P1 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 1
M143 H1 S280 ; set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0.3 I1 F500 H-1 ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P2 S1 I1 F500 H-1 ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I1 F500 H1 T50 ; set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools

M563 P0 D0 H1 F0:2 ; 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

; Custom settings are not defined

; Miscellaneous
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

Problem #2. When i auto calibrate it seems to be skewed a little to the right and doesn't prob the top third of the bed (under the z motor)

My bed.g

; bed.g
; called to perform automatic delta calibration via G32
;
; generated by RepRapFirmware Configuration Tool v2.1.3 on Fri Nov 29 2019 05:58:26 GMT-0700 (Mountain Standard Time)
M561 ; clear any bed transform
; Probe the bed at 6 peripheral and 6 halfway points, and perform 6-factor auto compensation
; Before running this, you should have set up your Z-probe trigger height to suit your build, in the G31 command in config.g.
G30 P0 X0 Y132.28 H0 Z-99999
G30 P1 X121 Y69.86 H0 Z-99999
G30 P2 X129.9 Y-75 H0 Z-99999
G30 P3 X0 Y-150 H0 Z-99999
G30 P4 X-129.5 Y-75 H0 Z-99999
G30 P5 X-121 Y69.86 H0 Z-99999
G30 P6 X0 Y59.15 H0 Z-99999
G30 P7 X56.09 Y32.38 H0 Z-99999
G30 P8 X64.95 Y-37.5 H0 Z-99999
G30 P9 X0 Y-75 H0 Z-99999
G30 P10 X-64.95 Y-37.5 H0 Z-99999
G30 P11 X-56.09 Y32.38 H0 Z-99999
G30 P12 X0 Y0 H0 Z-99999 S6
; Use S-1 for measurements only, without calculations. Use S4 for endstop heights and Z-height only. Use S6 for full 6 factors
; If your Z probe has significantly different trigger heights depending on XY position, adjust the H parameters in the G30 commands accordingly. The value of each H parameter should be (trigger height at that XY position) - (trigger height at centre of bed)

If i need to add anything or change anything please let me know. Also i am terrible with the technical software stuff so go easy on me : )