For the front aero balance issue, what Ive done in the past is put slits in the vertical plane between the horizontal plane and the actual bumper (but low enough that the slits are under the front tray panel). Then to adjust downforce, just tape off sections of the slits.
Worked pretty well for me at Road America.
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Perf.des carbon and paint//Bride//Personal//Stillen//ARK//Jegs//Zex//RUFF//Eibach
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