I'd start by flipping the hooks around so you can squat facing out into the room instead of smack against the wall.
First, your upper back needs to be tighter. Think proud chest or Tits out. Pin your elbows to your sides, they are flared too far up right now.
Fix your gaze on the floor about 5' in front of you and stare a hole through it.
When you squat point your nipples at the floor and shove your knees out as you sit back. Bounce out of the hole and drive your ass up.