is your car slammed or what? how much is it lowered anyways? I would suggest adjusting your coilovers, go 6mm higher at a time.
I had a rubbing problem after I dropped my teg, so I just had to adjust it. this was when I had 16's on.
as for the ride being bouncy, unless you buy $500 coilovers, with new shocks and everything, its gonna be bumpy. stock shocks on aftermarket springs=shocks wearing out and (or) bumpy ride.
good luck adjusting them.
:thumbup: