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Tom,
I have the same issue with my car around the same speeds. I also know of a few other Superformances as well with the same issue. I bought Michelin PS2 which are basically the top of the line$$$$$. Funny thing about my shimmy, is it is not a constant shimmy, but rather shakes for a couple seconds, kinda stops then start again for another couple seconds. I've been rotating the wheel one pin drive at a time, one side at a time to see if it gets better. I did get better. I still need to rotate them a few more times.
I had the same issue with the Goodyear F1 Super car tires as well. I had one shop balance them on the car old school style.
Good luck.
Scott
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