Wow... 90g to balance?
I'd start with having the shop replace that tire. If that doesn't fix you up, then it's the wheel itself. Have them put the suspect wheel on the balancing machine without a tire on and spin it and see what happens.
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Six speed 2000 Boxster S
Arctic Silver on Metropol Blue | LN Dual Row IMSR | Arctic Silver console, spoiler frame & bumperettes | Crios mod | Technobrace | RoboTop module & modified convertible top relay for one-touch roof operation
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