Auto_Bed_Leveling: Enhanced G29 command

[Roxy]

OK... If you want to go back to the Unsafe Bed Leveling, we should probably add some debug code to print out what is going on.

It almost feels to me like you have some values stored in the EEPROM that are giving bad offsets to the add_homing[] array. But I know you have the EEPROM turned off.
Try this version of your Marlin_Main.cpp file. It has some debug stuff that it will print out for the Y-Axis homing operation.