Well, my front suspension is a bit different than most. Fabricated tubular upper control arms, stock lowers with relocated ball joint seat points, both with circletrack ball joints w/ spindle reaming. Suspension now does what a suspension is supposed to do when you go into a corner rather than all the wrong things.
Before these changes I had 15x8's w/ 3.5BS which is what's on the rear. With 235/60/15's this pushed the PS tire out closer to the outer wheel well because of the factory body centering issues and at speed and hitting a dip the tire would lightly contact the wheel well and cause a braking effect and make the car pull right for a split second. After the susp. mods I went with 15x7's w/ a 4.5BS which tucked the tires back in however there were now some full lock clearence issues w/ the wheel and susp so some 1/4" spacers and mior grinding took care of that. I do still have a slight full lock tire rub inside the wheel well somewhere but everything else is good.
I think its about impossible to beat the factory 4" BS for all the clearence issues with tires bigger than the stock 215/65/15's but Weld only offers 1/2 sizes so thats a pain.
HTH