I cant comment on handling as the 18x9.5 rims are only my street rims. The tyres came with the wheels when i bought 'em so im just using them until they wear out. In saying that, I have seen several other people using the same combination of tyres on circuit 32gtr's (235/40/18, 265/35/18) so they can't have that adverse an effect on handling, since they have similar rolling diameters anyway. I use 235/45/17 RE55s for the track on 17x8.5" rims.
Ronin_09, my rears aren't rolled, and no massive camber, just some slight natural camber from lowering the car. Why do you ask? Have you had some problems with 265/35/18 tyres on a similiar sized rim?