Kossel 2020 rigid carriage with eccentric wheel axis

After fitting SgaboLab's carriages to my kossel I was surprised that my auto calibration in marlin 1.1.8 standard deviation fell from around 0.025mm to ~0.05mm with very poor first layers due presumably to the carriage offset effectively pseudo rotating the position of the towers.

I noticed that the arms were no longer centred with respect to the tower (from side to side / laterally not closer/further from the centre of the bed) because apparently he had some wheels that were bigger than the