Looking at the 3rd set -->
Why are your rolling the bar around on your back? The bar starts off too high and it looks like you are intentionally rolling it higher? Grip it so it doesn't roll! A bar with center knurling would help as well.
- Put the bar 1/2" lower on your back (at the start). You end up rolling it up into a high bar position by the end.
- When you unrack, get your hips under the bar, get a proud chest, then unrack. You are currently doing a good morning to unrack.
- Proper footwear would help you a lot
- Stay in your hips a touch longer and drive your knees out harder.
- Work on *slightly* speeding up your descent into the hole (stay tight, don't dive-bomb). You are basically doing tempo squats here which are harder.
Focus on: bar position, knees out more, a little faster descent