I found that the filter wheel doesn't repeat position so flats can be unusable.
Firstly i believe the FW driver should be set to unidirectional by standard, this will certainly help by eliminating rotation direction since stopping position has a big change when switching direction.
Secondly it seems the stop position varies when the filter wheel moves 1 position or 2 and more positions, a fix could be to force the filter wheel to move a full rotation.
I would love if the person making the driver could get in contact with me about this because i'd love to be able to help find a fix for this ASAP before more people gets the filter wheel and find the same problem.