I have 18x7.5 w/ 45 offset.

I'm dropped a little more than 2.5".

I rub a rub a little in the front using 225/40/18 and camber kit (right now my front camber is - 0.6).

No rub w/o camber kit in front, but I would have > -2 camber.

Using 215 tires would help a little.

As for rear, absolutely no rub, even after I put washers to fix the camber.