I'd defiantly like to see the rest of the video, did the flaps depart the plane? Were they live hinged or pin, were the flaps factory installed?
When was the crash, recent or some time ago?
Take your pick on the elevator balancing, it's been done to death here and the opinions are split, I've never done it because I don't like to add weight and I've never seen a problem because of it, other people have and swear by it and have valid theory's about it. I have seen it recommended by some manufacturers and not by others so who knows