alex,
i lived in LA for a while and had 45 profiles on my car there. i did relocate back to the UK some 4 years ago, however, the quality of the roads sucked big time and had a pothole flatten two wheels in one go (both front and rear offside) on los feliz..
and then this from debris on the 110...
as you can just see the damage was bad enough to flex the alloy enough to flake the paint.
if the roads still suck, then keep the thicker profile as a word of consideration.. replacing porsche wheels and low profiles could get to be an expensive and annoying hobby when the roads are cr@p !