Originally Posted by
Charles Jenkins
I think he means that you're not squatting in the normal position; instead, you're just kind of plummeting into the bottom and then trying to assume the proper squat position as you come out of the bottom.
Your back angle actually isn't terrible coming up out of the hole (though it could be more horizontal); the issue is getting into the bottom position correctly. Instead of starting your rep by trying to drop down, focus on pushing your knees out and your hips back, pointing your nipples at the floor. You'll probably need to slow down a little bit, too.
You're doing a nice job of driving your hips up, considering your starting position. Getting your descent under control and with the right back angle will help a ton.
For the deadlift, your weights were flying up for the other reps, so that weight's just fine. Just make sure you're using plenty of chalk. Grip strength, even double-overhand, shouldn't be a limiting factor at that weight, but sweaty hands will definitely lose the bar. I mean, your bar speed's crazy good there. You could probably add ten pounds to the bar for a few workouts. Just make sure you've got plenty of chalk.
ETA: he's also right about your bar placement; it looks a tad high. Jam it down below the spine of the scapulae. It's uncomfortable.