WRT to pick spinning around…
Justin’s funk course has an exercise buried in one of the lessons that helped me quite a bit, even though I have no interest in playing funk.
Basically, you deliberately let the pick rotate a full 360 degrees, in either direction. Once you learn to control this, you seem to learn how to prevent it from happening, and also get it back in position if it moves.
The exercise is around the 6 minute mark.