I put a bunch more zip ties on, looks like it improved a little bit but not much. Also tried full face helmet but that is even worse. I think the neck brace (or however you wanne call it) of a xc type helmet does actually a pretty good job. I also tied the clip strap which goes around your lower jaw so that I run out of oxygen and fell off some skinnies and into a pond :-) . Riding with 300$ on your head changes your riding so, don't know if I want to put 600$ up there.
I think the biggest problem is actually the thread of the camera since it is plastic so you can't make it too tied other wise it rips out the thread. Also the camera isn't made for that kind of stuff, wonder how it is on smoother trails.
I think I have to consider buying a decent helmet camera, perhaps santa claus brings one :-).
Here is the movie, be careful that you don't get sick since it is quite shaky, it is also quite long (8 min.):
Upper Oilcan, Ladies Only + Lower Ladies
http://www.vimeo.com/1691050