It will reduce the chance of washing out in the corners, but make is less stable down the straights. Adjust in 10mm increments. Try it and see how it feels.
I herd that at high speeds it had some headshake, I havent really experienced any of that and I have had it wide open in 4th a few times. Would moving my forks help? The terrain was fairley smooth when I topped it out. I guess I will never need to go that fast anyway.