I don't know the answer but maybe someone else will see this bump.
I think the carousel is driven by a geneva mechanism, so there is no phase adjustment of the final pocket position. I'd be looking for incorrect shimming up somewhere around where the wheels run on the tracks, if you took all of that down when doing your replacement.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)