Ugh! Sounds like you had a decent setup...

I stopped riding my gopro on my kite board after it snapped a mount (admittedly) during a fair sized stack. The angle is cool, but not at the cost of losing a camera every once and a while.
Unless someone can build us a better mousetrap.
PS: I wonder how much foam you need to stick to the back of a gopro to make it float - just a though...