[cobrashoch]

sirelesar- 99% of the time when a M-2 setup has bump steer it's because it's been narrowed and they are using a stock rack. The rack arms pivot on a arc, and that arc does not match the arc at the hubs attachment point. The answer is to buy a custom rack that is designed to match that cut down hub to hub width, at the hubs attachment points.
If you still have bump steer you will need to unhook the rack arms, and take out the springs so you can raise and lower each hub in turn conditions that simulate bump conditions. What you are looking for is bind. Sometimes the guys that narrow those things don't do such a good job. For example the arms have to be mounted perpendicular to the frame for the hubs arcs to be even front to back in turn situations. If the arms are mounted forward or towards the rear the hubs travel arc will be uneven and cause bump steer. None of it is that hard to find but it does take some time and measurements. The fix however may be complex or need welding, so I would find someone that can straighten things out. Bump steer in a narrowed M-II setup can be 100% done away with, but you will have to play with it to get it there. I know of no neat bump steer kits that address the type the problems created by cutting down a M-II incorrectly either.
Good luck,,,,,,,
cobrashock