There are some descent universal dampers out there that you could mount to the fork and frame. I have been looking into this, I have had a small vibration a few times when I was playing pretty hard. Nothing to make me worry too much, but if I could do a universal damper for about 100 bucks or so, I would do it! Ohlins has one that I have seen for about 200 bucks. when I was looking at my bike this last week, looks like on the left side you can take that gay plastic radiator scoop thing off, mount the frame side there, and then run it to your fork and use the fork mount and your good. Ohlins set up will prob run about 250, I think there are a few other brands that are not as nice as Ohlins for around 100, but still are 7-12 position adjustment, might try that after the fork valve upgrade!!!!!
DJ