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wheel balancing is your culprit. I've got it too after FIVE trips to discount tire, last of which was a "road force balance" job on all four wheels, which is what you should find.
If you can find a local speed shop that specializes in balancing wheels on cars that are driven over 100 mph, that's where you should take it.
Boxsters seem to have this problem frequently and keeping the wheel from jiggling is going to be one of those things you'll work on a lot. You'll also learn to determine the difference between road feel and shimmy due to an unbalanced wheel.
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