For rocks, you want less high speed compression damping. Your stiffer springs will not be as big a problem as having too much high speed damping. Unfortunately, the clickers on your KDX will have their biggest impact on slow speed compression damping.
Since you dont' have the luxury of revalving, I would just back off the compression damping several clicks front and rear. The forks are where you need to make the biggest change. How many clicks depends on where you are set now. Changing from 1 clikc out tow 3 clicks (2 additional clicks) makes a much bigger difference than going form 11 to 13 out.
KDX's are notorious for having soft springs, and Kawasaki uses too much high speed compression damping to compensate. When you try to go fast in serious rocks, guys with plush suspension (revalved without so much high speed damping) will have an advantage.