SNS,
A common way to reduce the rake is to increase the ride height of the rear end. Longer dog bones (easy to buy or build) will do it or sometimes it can be as simple as retuning the rear suspension (sag, spring, damping, or all 3) to ride higher in the shock's stroke. I found that the trick to steering the KX was weighting the pegs. Try putting all your weight on the inside peg enterring a turn and see what happens. Hope this helps. Cam.