I don't understand why it doesn't work for you Thayls

When I customised mine I did only the following with colours:

1. Copied RGB settings for all colours in palette from rom_col10 to rom_col2 and from rom_col11 to rom_col3 - this moves the Mini green scheme into the brown BMW scheme - see above

2. Updated map colours, default map area to 24,29,24 in rom_col2 and 3

This works in both split and wide for me.