its the M772 shadow.

chainrings are 50, 39 26 (stock was 50, 39, 30)

Chain is the original size stock size

re hanger alignment - its a new hanger - I'm not sure how to align it past fitting in place



quick edit: i did take the bike to the LBS who fiddled with it for some time. They did not improve on what I had done - but found no issue with the RD, but vaguely suggested this problem could be a compatibility issue