Yessir, tried 3 of them, and 2 motors (13.5, 17.5). It's got to be a programming issue of some kind. Only thing I can think of to try is to program it with the motor completely disconnected - they were already all soldered up when I tried before.

EDIT - that did the trick for whatever reason. Programmed it without the motor connected, soldered it back together and now works like a champ.