I'm running 275/35/19 all the way around on the Brembo wheels. No pics at the moment but I can go full lock and it doesn't rub at all, and I can still rotate. 255->275 may not seem like much but IMO it enhances the look of the car.
275/40 may have been better from a ride point of view, 35's don't leave much sidewall.
I get much better launches and much better wet grip with the new tires- I don't know if that's the width or the switch from Pirelli to Michelin. I can say that my setup now is much superior to the 255 P Zero's- more progressive power oversteer, reduced understeer (I'm guessing the ratio of ((front weight/front rubber)/rear rubber) changed, perhaps giving more mechanical grip in the front) and a better feeling of control in general. Again, not sure if better from bigger, or better from different tire, but definitely better.
2002 C5 Z51. MCS 2WNR TT2 coilovers, 18x11 Forgestars, 315's, yada yada. Built Z06 T56. Bolt ons. Coming soon to a CAM event near you.
2013 F150 6.2L. 9mpg.