+1 shockwave. nice setup on your car!
i do run the 295/45/18's on the rear and the tire rubs when i have my rim/tire drag setup in the car OR when going on the freeway and hit a big dip. nothing major though and i've actually thought of going with the 40 series tire like you have.
and +1000 on the top of the tire tucking inside the fender for the most part. i see why you don't have a rubbing issue. i might sell my rear set of tires since they only have about 1400 miles on them right now and go with the same size as you.
here's a few shots of mine