Since your running in friction mode, and I assume you're used to trimming it properly, I doubt it's any of the issues related to index shifting.

Also, since the chain and all the sprockets were replaced we can eliminate the typical chain/sprocket wear mis-match problems.

Also the jockey wheel didn't suddenly get worse when you made the change, so unless you were having shift problems before, we can rule that out, though replacing it won't hurt.

That narrows the possibilities down to not many. I suspect that either the chain length changed or one of the sprockets isn't the same size, and the RD is sitting either too close (more likely) or too far from the cassette causing interference between the cassette and jockey wheel. They jockey must lead the chain onto the sprockets, and to do so must be forward (along the chain) by about an inch or so. Adjust the "B" screw (back of upper body) to set the height of the RD to be close but never too close to each sprocket, especially the larger ones where the clearance will be closest.