This is based on one run through the video (actually 75% of it), so forgive me if I missed any finer details.
As the weight gets heavier, you start losing that good first pull posture, i.e. you start leading with your hips, which shifts your weight forward. Then you're chasing the bar, so you can't quite extend fully, you have to jump forward a bit, the rack position is less secure, and it's tougher to stabilize the torso. Fight that by trying to lift the chest throughout, and make sure when you DL and pull that you're doing the same - more posterior chain emphasis strength work will exacerbate the problem.
Try widening your grip. Hard to see as well as I'd like, but I'd venture to say taking the hands out will give you a better rack and speed up that turnover of the bar. Try a width that, when the bar is at your shoulders like you're going to press, your forearms are about vertical when viewed from the front.
The moment the bar leaves the floor, get back on your heels and stay there.
Keep that bar a little closer as you pull under. It looks like you may be gripping the bar too tightly for too long - allow the hands to relax as your elbows come around (forearms about vertical) and just drive the elbows up. that will keep the elbows pivoting around the bar instead of the other way around.
Finally, commit! All those misses should have been easy makes, but you gave up - they were high enough for power cleans.
All in all, quite good actually.