225/255 A/S tires will work. I used to have Yokohama S4s on my car a while back and I was on H&R Super Sport springs and did not have any issues at all. Worked well in the German winter and anywhere from 2-6 inches.
Funny thing is that you're saying TR said 255's won't work on the rear.........they were the ones that recommended me the 225/255 A/S Setup back in 2009.
Quote from Ezeedee regarding car mods:
"you're only done when you sell the car