Nice video! Here is what I see. You have really good shoulder and bow arm alignment at full draw!!! Overall very good form from this angle.
Now watch REALLY closely as you release. Watch your string arm elbow. See how at the last moment, the elbow starts back to the right? It is a small movement but it is a collapse that is causing some of your string hand problem. Try to keep that elbow moving toward your rear, don't let it come back forward. This is largely the cause of the hand moving out from you face (flipping
Another thing that may help. Try pulling your string hand thumb down and back. Another way to say it is to see if you can pull the tip of your thumb down so it hovers over the palm of your hand. At full draw, your thumb would ride under your jaw and lay on the side of your neck. I know many folks shoot with an elevated thumb (laying up on the side of their face) but...
holding your thumb down and back actually reduces hand tension and allows the tendons controlling the string fingers more freedom of movement.
Over all your string release is pretty good but I believe it can be better with the above suggestions.