Video 1: Looks a bit loose and they are both HIGH.
Video 2: Same
When you unrack the weight, you can see that your knees are soft.
Lock them before you start.
So:
Air/brace/root
Unrack
Lock knees/squeeze glutes
Reset brace/root if needed
Start
And on the depth, it could be the straps are to tight, it could be mental, or 100 other things.
Try doing warm up sets to a box, but don’t “box squat”-just touch and go for depth reference.