Wow. I know the car I'm messing with is lower but a 9.5" width w/an effective 4.125" BS would seem to be flush w/the outer edge of the fender. Even @ slightly lower than stock height I would have thought that would be susceptible to damage on compression. Another g-body auto-x'er/tracker I know of w/a later MCSS is running 17x9.5's & he has 5.00" BS & about -.75 Camber.
I know your inner wells are removed for additional clearance. Did you trim away any of the inner sheet-metal structure the wheel-well attaches to as well? How mush static NEG camber do you guys have dialed in on that thing?
The plastic wheel wells are removed but nothing else. We could bolt them back in if necessary.
We have 2 deg neg static for autocross, not much street driving at the moment.
Our a-arms have the same "track width" as stock but are 3/4" forward to achieve the caster we need. The upper ball joint is located rearward also.