I am currently running 225/40/18x7.5 +50 offset in the front and 255/35/18x8.5 +52 offsetin the rear. I have stock shocks with Eibach Pro Kit Springs which gives an inch drop, however, i am still experiencing some rubbing issue everytime i hit a lil dip. I was thinking bout selling the springs and get the ground control coilovers. Do you think i can go thinner or is this just a common problem?

 

You might be able to cure the problem by getting a coilover setup (thereby allowing you to adjust height and also get stiffer springs)...

I have stock suspension with Tein S-Tech springs (also a ~1 inch drop). And I have 18x7.5 and 18x8.5 with +48 offset all around. I recently got new tires 225/40 and 245/35. For normal driving I haven't experienced any rubbing problems, but if I'm taking turns at high speeds then I have some rubbing. So I'm pretty sure if you got 245s for the rears you would cut down on some rubbing...

 

I would go with the 245/35R18 on the rear. That should solve the rubbing issues. You may also have to run a little more negative camber on the rear.

 

one solution is rolling your fenders.