I'm saying its the geometry. My SM has been lowered a couple inches, and it gets a little wiggly at high speeds. By putting on smaller wheels, the fork angle has been steepened, which makes it much "quicker" on turn in, but also more unstable. A lowering link in the back should fix it up. There should be a ton of lowering links for that bike. Also, a steering stabilizer would help. All these comments are assuming that nothing else is messed up, i.e. wheel, head bearings, etc.
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