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@engikeneer I was running a G91 for relative move followed by a G1 H2 X5 F2000 to move along the x-axis; it seems this series of commands side-steps the Core XY calculations and resulted in the issue I was experiencing.
I have run the homing sequences on my x and y axes now and everything is working again; the reason I was not doing this is I wished to ensure the axes moved in the proper direction before attempting the homing sequence (I use motor-stall homing on all axes).
Thank you very much for the suggestion, I am unsure if the experienced issue is a bug or just the expected outcome; either way your help is much appreciated!!

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alright, achieved proper z-offset with following configs
config.g

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.3 on Sun Jun 28 2020 17:19:16 GMT-0400 (Eastern Daylight Time)

; General preferences
G90                                                	; send absolute coordinates...
M83                                                	; ...but relative extruder moves
M550 P"CarbonCube"                                 	; set printer name
M669 K1                                            	; select CoreXY mode

; Network
M552 S1                                            	; enable network
M586 P0 S1                                         	; enable HTTP
M586 P1 S0                                         	; disable FTP
M586 P2 S0                                         	; disable Telnet

; Drives
M569 P0 S1                                         	; physical drive 0 goes forwards
M569 P1 S0                                         	; physical drive 1 goes forwards
M569 P2 S0                                         	; physical drive 2 goes forwards
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 X160.00 Y160.00 Z800.00 E418.60                	; set steps per mm
M566 X1800.00 Y1800.00 Z400.00 E4000.00            	; set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z2000.00 E120000.00       	; set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z400.00 E2000.00            	; set accelerations (mm/s^2)
M906 X1450 Y1450 Z1450 E1450 I30                   	; Set motor currents (mA) and motor idle factor in per cent
M84 S30                                            	; set idle timeout

; Axis Limits
M208 S1 X0 Y0 Z0                                 	; set axis minima
M208 S0 X300 Y300 Z300                             	; set axis maxima

; Endstops
M574 X1 S4                                         	; configure sensorless endstop for low end on X
M574 Y1 S4                                         	; configure sensorless endstop for low end on Y

; Z-Probe
M574 Z1 S2 ; Set endstops controlled by probe
M558 P5 C"^zprobe.in" I1 H0.7 F1000 T6000 A20 S0.005; PINDA
G31 P500 X30 Y-20 Z2.75							; set z-probe offset height
M557 X100:200 Y100:200 P2                           ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138     	; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                              	; create bed heater output on bedheat and map it to sensor 0
M307 H0 B1 S1.00                                   	; enable bang-bang mode for the bed heater and set PWM limit
M140 H0                                            	; map heated bed to heater 0
M143 H0 S120                                       	; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T100000 B4138      	; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                               	; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00                                   	; disable bang-bang mode for heater  and set PWM limit

; Fans
M950 F0 C"fan0" Q500                               	; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1                                     	; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                               	; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45                                  	; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0                                   	; define tool 0

; Custom settings are not defined

; Miscellaneous
M501                                               	; load saved parameters from non-volatile memory
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" 	; set voltage thresholds and actions to run on power loss
T0                             			   		  	; select first tool

homez.g

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.1.3 on Sun Jun 28 2020 17:19:17 GMT-0400 (Eastern Daylight Time)


G91              												; relative positioning
G1 H2 Z5 F6000   												; lift Z relative to current position

G90              												; absolute positioning
G1 X150 Y150 F6000 												; go to first probe point

G30 															; use probe to find Z 0

G91             												; relative positioning
G1 Z10 F6000      												; lift Z relative to current position
G90             												; absolute positioning

I think the stem of the entire issue was the incorrect homing command (using the endstop style command instead of a probe G30); still need to determine what could be wrong with my thermistor
Thank you very much @Phaedrux for the assistance; I got all turned about when messing with the offset/axis limit/homing commands and your assistance was quite helpful (as well as all others who chimed in)!