305 isn't going to do anything extra for you on a 9.5 rim. Probably even hurt traction. I'd go 285 max. Michelin SS are a great DD tire. I'm running 20x10 20x11 and have 275 Invo's on the front and 305 555Rs on the rear and they do decent enough on the street/track. NT05 and NT05R are a much better DR but they wear significantly faster. SS's don't hook well on the drag strip but do great for handling, wetter conditions and wear well.
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