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are you panning on coilovers/springs?
if not, the 9.0" et30 is not going to work at all in front, and the rear will be past flush ~ 0.5".
8.5" et40 in rear is perfect. up front, if you install a 5mm spacer it will rub on the liner, and without the spacer it may rub on the strut housing. i'd try it without the spacer first.
while track front vs. rear does change balance a bit, i think the bigger issue is the difference in contact patch in a staggered setup. i believe the understeer is due to two things: too little grip in front relative to the rear, and not enough front neg camber. going to a square setup will certainly relieve one of the issues.
also, if you're lowering the car, remember your brake bias will move rearward.
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