I recently replaced my front big brake kit with a BIGGER brake kit due to frequent rotor over-heating and cracking. I've had to install 10.5mm spacers (with hubs) on the front so the spokes of my 17" wheels clear the new Wilwood Superlite radial mount calipers. The 235-40-17 tires protrude slightly from the front fenders but the vertical clearance and stiff suspension should prevent tire/fender contact. I'm concerned using 10.5mm spacers on back could cause tire/fender contact due to less vertical clearance. Does anyone have experience running spacers on front but not the rear, especially on an aggressively-driven E30 325is track car, and have comments regarding the impact to handling (or lack of impact)?

Thanks!
Kent