Help I can't get the auto level right

I go through all of the procedures and the gap between the head and the bed is a little off. I have tried everything I can think of to change the head to bed space. I have tried prob offset and home offset and neither seem to have any effect. Has anyone got this working?

I had found the Robo R2/C2 manual a couple of years ago and It say use the home offset. Here is the manual:
https://drive.google.com/file/d/1qnV6C_lc7KV86p0g5qLAKNnt72os-b5r/view?usp=sharing

I have verified that going to the LCD and changing the "home offset" works.

I also found that it is east to modify the number of points. I have a Robo R2 clone with a 12x12 bed that is randomly warped by up to 0.06mm. It also changes by 0.1mm from cold to 70C. I changed the number of points to 5x5 in the Marlin code to compensate..We should set up a Marlin topic, I have made many changes to the Marlin code.

This is my initial Gcode:
;heatup of bed
M190 S65
; set to millimeters
G21
; home
G28
; set absolute mode
G90
; turn off fans
M107
; move bed down 230mm
G1 Z230 F300
; Home
G28
; zero extruder
G92 E0
; Robo Leveling
G36
; home XY axis
G28 X0 Y0
; zero extruder
G92 E0; move bed to printing position
G1 Z0.2
;non blocking heatup of bed
M140 S60
;heatup of extruder
M109 S220
; print 150mm priming line
G1 Y-150 E10.0 F500
; Retract
G10