I am now running 245/50/20 up front and 255/50/20 out back with edelbrock IAS Shocks up front and Monroe Airshocks ou back My fender measurements are around 29 front and 29.5 out back. I some time bringhte back down a little but i like a slight rake.
I am running the same setup as you are but with 275/45/20 tires. I don't have a problem with the width but I have a problem with the tire hitting the fenderwell on bumps. Do you have the same problem? What have you done to fix it? I have bilstein shocks up front and they help but its still hits on bums on the freeway