why not start with camber plates? A larger front sway may help settle the front end a bit, but I wouldnt say the m3 has inherent understeer. it seems quite easy to get the rear to rotate, and a stiffer front seems to me that it would make the rear even easier to kick out. ie, unpredictably.
it could be worth experimenting, but my take is to try to settle the camber first.
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