I think the video is pretty cool. I seem to detect the club going back to the outside on the takeaway with a little bit of overcompensation to the inside after you pass hip high. Perhaps. you are also trying to take it back a little further than your flexibility dictates; hence, your head moves up at the top of it and it travels downward quite a bit as you transition to the downswing. Since the club was traveling to the inside it encourages the over-the-top move. Incidentally, some very good golfers go down after the ball, Tiger and Tom Lehman to name a couple. They just don't lift their heads on the back swing. Try practicing at 60% and taking the club straight back on the target line and letting it come naturally to the inside, the rest will correct themselves. You are almost there!