Hi Gfreak:
Here's the obvious stuff:
1.) You don't arch into your unrack; for a low-bar squat, you want to unrack with a tight, arched back. There are different ways of cuing this: you'll see many lifters almost drop into their unrack by pushing their hips forward. But in my opinion, your torso appears almost too vertical (such a thing, I suppose, is possible) for unracking at low-bar position.
2.) You arch hard during the start of the eccentric--and this is good--but part of the reason you're doing this is to compensate for the lateral distance your hips have to travel. With a low-bar position, you typically want your torso to be leaning slightly forward--five degrees, maybe--and you want your hips slightly further back.
3.) The other thing is that you're corkscrewing your concentric in a clockwise fashion. This one's really obvious, and I'm not sure if it's the result of a max attempt or if it's characteristic of all your squats. If it's the latter, then it's obviously a problem. I can't tell what's causing you to turn the bar like this when you squat up with it, so I'm not going to be helpful with a diagnosis, but do keep an eye out for it. Sometimes, the issue can be really small: it took me a few weeks, but I finally realized that a slight tilt in Babyeater's bar while squatting was being caused by how she held the bar in her right hand, allowing her right pinky knuckle to drift down and then ****ing her wrist back to compensate.
For you, I don't see any asymmetry issues in your shelving of the bar, so I imagine it has something to do with either a.) how you're distributing the load on your feet, and where you're pushing, b.) where your knees or drifting, or c.) how well your abductors and adductors are functioning. But that's all guessing on my part, and I could be completely wrong.