The balance is only as good as the tech who does the work and in my experience its not uncommon to get a sloppy job. Return and ask for the tires to be re-balanced and 99% of the time you'll be fine.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
I had the same problem with these tires on my wife's RSX, rebalancing solved the issue. The tread does seem to squirm a ton, but they were bought due to the excellent snow rating for an all-season, so of course we got no snow this winter!