1. I have not heard of this problem.
2. I have a small space between my clutch bell and flywheel, it looks to be about 1mm but I have not measured it.
3. I have heard of this and was told to mount the lock nut backwards so the nlyon part is threaded on first.
4. make certain that all of the suspension parts are free and not binding, then continuee to look for a better setup. I used one of Barry Bakers setups and it worked it awesome on my large high traction track.
More rear toe will help keep the back end in place or softer rear tires.
Good Luck