I am swapping out my 21" Uber OEM Tires and Wheels for some 19" 9 1/2 Martian Wheels and Tires. Was originally planning on square set up 255/45/19's. The discount tire guy said I could go with 275/45/19 on the rear to keep the staggered setup. I don't take it to the track. Any opinions would be greatly appreciated. Do I lose anything by going with the square setup?