Nice vid! I would suggest, though, putting your chest up and out when you get under the bar, and holding that position as much as possible before un-racking. Your neck sort of went down which caused your back to take most of the movement on the way up rather than your legs. The squat looked a little painful when you leaned forward.
However I know it's a MAX lift, and I certainly can't lift 400 lbs just yet, haha. Great job!