Wandering is what KDXs do. Wondering what they'll do next is what KDX riders do. Just about any bike will wander in sand and mud -- the KDX just greatly exaggerates it. You really need to analyse just exactly what the front end IS doing. On hard pack, the KDX front end tends to "wash" or understeer -probably caused by insufficient rebound damping. On "sticky" surfaces -mud & sand, I find that the front end does just the opposite -oversteers. Because of the bike's steep steering angle, whenever the tire "bites", the front end takes off in that particular direction. The rider tries to correct, the tire "bites" in a different direction and off we go again - and it's not in a straight line. IF this is what your's is really doing, stiffer fork springs, less rear preload , forks fully extended in the T clamps and rider a bit to the rear should help. Unfortunately all of these things tend to increase front end "wash out" as soon as you get on hardpack and higher speed surfaces. It appears that there is no easy fix.