Tried to watch your video but it was removed. Haven't read this whole thread, but this is my advice. Learn to disengage her hindquarters. A horse cannot rear when their back feet are moving. I have seen this work.
Also to add, my mare reared up with me once. Only one time, and guess what...she flipped straight up and over out of NO WHERE!!! So I hope you see that it can happen sooo easily. And when they go, they go hard and fast. That's 1,000 lb animal landing on top of you. Lucky to be breathing. Anyways, Good luck and be safe please!!!