G10 P0 X0 Y-20 Z0 ; set tool 0 axis offsets
You only have a single nozzle, so why do you have an offset in Y? Tool0 nozzle should be considered 0,0,0
G1 X32.3 Y32.3 F10000
In your homez you should position the probe at the center of the bed for best results.
G10 L2 P1 X0.00 Y0.00 Z1.78
Not sure why that offset exists in your config-override.g. It shouldn't. Have you sent M500 at some point?
where is the right place to enter in that The nozzle needs to be -0.29 closer to the bed after a G28?
Adjust your G31 Z value. A higher value moves the nozzle closer to the bed after homing. A smaller value moves it farther away after homing.
So if you need to be 0.29 closer to the bed, add 0.29 to G31 Z