10 years ago by
A Pianist
The right hand is a bit tricky to see, but I did notice the movement you mention. One solution could be to over hold one finger throughout the entire passage (maybe the thumb), which would serve two purposes. Firstly, it would anchor the hand and reduce the vertical movement of the arm to a manageable level. Secondly, it would provide you with a sense of structural security that I think may be missing at the moment.
Another option is to look at the section of the Craft book (page 142 in the first edition: Maximize finger articulation, eliminate arm shake) and DVD. It gives an image of incredible clarity of how much the fingers can move, and how passive the arm can be when the fingers are moving. I'll agree with what Alan says in the book though - it is very difficult at first.
I hope that is of some use to you. Perhaps next time you do a video you could have the camera to your right and that way we can get a better look at that side.