who did the alignment?
if it was a Mercedes Dealer, see if they will take a look at a reduced fee to see if things are within spec. If your rims show no or little rash they can assume your particular about not bumping into curbs.
also double check your definition to make sure you meant to use the term FEATHERING and not CUPPING. Because the vibration and cupping may just mean that wheel needs a new balance.
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