Reducing body roll. SS springs, sway bar, or both?
Roll the quarter panel lips. They make a tool for that , I just used a baseball bat.
I have 29 14.5's on 12 inch wheels. The only place they rubbed was behind the tires on the quarters so I put stainless chip guards on so not to rub the paint off. I don't like a high car. The lower the better.
Maybe your leaf spring bushings or shackle bushings are flexing. I could drift my car and they never rubbed