I had the exact same thing with my spacers so I went to get my tires road force balanced. They told me one of the wheels was bent and the shimmy was still there after they balanced the tires. I was going to get it fixed but before that I had a set of KW V1 coilover installed (which I love) and the vibration is 98% gone (nice side effect). I'm still going to get the wheel fixed down the line but thought I would share my experience.
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