Personally I would change the following:
Physics & handling: 4.5 (possibly 5).
I think a 4.5 for physics would be fair. It's not a 5, because wet track surfaces don't seem to dry up more quickly when cars drive over them.
I LOVE the way the Porsche sounds and handles. I bought ACC yesterday and only tried out a few different cars, but when I tested the Porsche, I was sure that's the one I want to stick with!