I'm no expert so don't act on my suggestion alone. This is just my novice observation, but your squat looks like you're doing the same thing I'm doing. You unlock at your hips first and your knees don't get in position within the first 1/3 of you descent. I believe this causes loss of tension and really impacts the bounce out of the hole. This is something I'm really struggling with and it honestly didn't bother me (pain wise) until the weight got to be about 1.25 x my body weight. It wasn't until a couple of weeks ago that I realized there was a problem.
edit:
Also you should address your unracking of the bar before you start. I think a staggered position will lead to it's own set of issues.