seafreak - your chine walking might be cureable - your situation sounds pretty typical for a performance hull. You may also wish to check out my article on "Chine Walking"
Chine walking can arise with most high performance hulls. As the hull accelerates, lift increases and the wetted running surfaces that are required to support the hull are reduced (more Speed = more Lift = less Surface). As the speed increases throughout the velocity range, the hull often gets to a point where the lifting surfaces become very much reduced and the hull is now “balancing” on a small area of the hull. When that surface becomes sufficiently small, it becomes very tricky to “balance” the hull on its vee or pad. The result is a rocking of the hull from side-to-side, from port-chine to starboard-chine, back and forth. This rocking can tend to get a little more extreme with each motion, and so the “balancing” must then be provided by additional driver (steering/throttle/trim) input in order to maintain the hull in a balanced state.
If left unchecked, the boat will rock from side to side with increasing drama. This is because the boat is now “inherently unstable” – meaning that if left alone, the “imbalance” of the hull is more likely to get worse on it’s own, not better (the worse it gets, the worse it gets). If it gets out of hand, you can get into real trouble!
Setup of your hull and driver “seat-time” are the best solutions to the problem. Usually an alteration to the hull, or hull setup and/or modification to your driving methods (read seat-time) will improve the problem. There are definately some things you can do to minimize the problem.