So here's the deal. When you have a higher offset (50+ on a 9.5"wide wheel) you are going to sacrifice potential concavity. Period. The lower the offset, the more potential concavity you gain but you then start to give up tire width to clear fenders at some point.
And the concavity of the forgestars don't change between, say, 42 and 50 for an offset in the 9.5" wide model. They make a blank and just machine the hub section down to reach the desired offset. They do have different blank shapes though, which some are more concave than others. Their "most aggressive" may not be aggressive enough for you unless you send your car to them so they can test-fit.
What it comes down to is you need to decide if you want wide rubber with little fender/camber mods or concave wheels and potentially need to roll/pull/add camber to fit the tire size you want. It's rather difficult to have both on these cars. It's just how it goes.
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