Hi! Thanks for posting. This is great playing and you are well on your way. In general, you’re using wrist motion, so I’d recommend checking out the new “wrist motion” section of the Pickslanting Primer when you get a moment. There is nothing specifically wrong with your form, but more awareness of why you “see” pickslanting sometimes and not others can be helpful.
Specifically, there is a particular sweet spot of form you can use with wrist motion where you don’t really do “two way pickslanting” any more, at least not the way we have explained it in the past. Meaning, you’re just keeping the arm in the same spot the whole time and the only thing that is changing is the direction your wrist is moving. You are already pretty much doing this, which is why you sometimes can’t see any visible motion in your arm or change in the “pickslant”, and yet you can still make the string change cleanly.
Another general comment as you work on this, is to occasionally go faster just to make sure your motions are efficient. They look that way, but until you kick it past 150-160bpm sixteenth notes you really can’t tell for sure. Sloppyness isn’t as important as motion smoothness in the early stages.