One random thing I noticed practicing the ferra combos in this video:
You can hold back after a dash and input 2,1 at any time to get you the neutral 2, 1 string. This allows for extra precise spacing when doing the pickup into ball. I’m still working on it, due to consistency I occasionally sub in f1 ballroll for the relaunch instead of dash 21 ballroll for the Ferra combos I linked.
The other thing I noticed is when doing the f3,4 up+kameo 4 microdash 2,1 roll j22 ballroll combo, it made sense to time out the first four presses street fighter style. So f3, slight pause, 4 immediate up+kameo, and then 2 just as ferra latches. I think it adds stability to time the first 4 presses this way.