Re: Backsquat critique, 5 @ 275
Most of them looked high to me. I feel you're folding over onto your legs instead of squatting down. Push the knees out when you squat, and maybe just a little more butt back when you start. Either grip the barbell or pin it with your hands, but as you noted your wrists look pretty cranked. You should have a sense of jamming the upperback into the barbell.
Looks like you control the weight ok, just need to focus and get that depth.