Sorry if this is a tip you are already familiar with, but constantly transitioning from edge to edge helps a ton with stability. That's how I bomb runs on my Evo. I don't stay on one edge long enough for it to chatter and wash out.
I'm finding this to be the case as well. The Proto rides like a rocker when flat base but rides like a camber board on edge. I find I'm riding my edges on it much more than I do my camber boards.