1. At the very least, pull the rack at least 16 inches from the wall or, better yet, turn around and squat from the open side of the rack. You ate so close to the wall that it's messing up your set up.
2. The bar looks too high on your back (see above) and you are not getting your upper back tight enough.
3. It's hard to be sure from this angle, but it appears your stance is a bit too narrow at tge heels.
4. Before you begin each rep, take a larger valsalva and squeeze everything harder.
5. Remember the Master Cue throughout each rep.
6. Apply these and shoot another video, ideally from hip height.