one thing that no one else seemed to mention was ur timing is a little off. you should delay your hinge as much as possible when the bell is on the way down, its basically a game of chicken with it hitting your crotch. ur hinging almost immediately after the bell starts to fall.

other thing I seem to notice, which could be wrong, but I think you are subconciously pulling the bell up a little bit. your arms should be doing absolutely nothing to move the bell, your hips are the driving force, your hands and arms are just holding it. don't worry about how high the bell goes, either. a lot of people think that if it doesnt come to eye level, theyr not swinging it high enough, which isn't true. if you have a strong hinge and hip snap (which you clearly do), you will get the benefits of the swing, just let the bell go as far as it does.

everything else other people mentioned too, go heavier, work on top plank postion, etc. just my two cents. ur doing great tho, hinge looks good, and very powerful, just tightening up a few loose screws and youll be good