I’m not sure if anyone else has the same problem, but here’s something I’ve noticed that has thrown off my synchronization at times when practicing various picking techniques with different escape motions.
I’ve recently been experimenting with switching between USX and DSX motions à la Antigravity. What I’ve noticed is that when alternating from one escape motion to the other, my fretting hand fingers sometimes want to follow along with anatomical rotations or changes in my picking hand. For example, when my picking hand goes from a supinated to a more pronated position (USX DSX) my fretting hand occasionally wants to mimic or mirror the rotation and slightly lift from the fretboard. These unintentional variations in my fretting hand can cause string buzzing, sloppiness, or other fretting or synchronization issues. This occasionally also happens when switching directions; sometimes my fretting hand fingers lift a bit when descending, or going up towards the lower strings, after ascending some passage.
If you feel comfortable with USX and DSX but switching between them sometimes causes issues, this could be part of the problem! Keeping the fretting hand isolated from the picking hand changes often (partly) fixes synchronization and/or fretting problems for me.
Does this sound familiar to anyone else? It could be something to have on your list for troubleshooting your technique!