I think you will solve your problem with the stiffer shocks. I had some stock shocks w eibach springs in the rear and I was rubbing on the left rear slightly when the tire would get pushed up. I rolled the fenders, and it helped some, but the tire was cut into already and I needed new ones anyway. I had plans to change the springs to h&r race to raise the car, and I went ahead and changed to bilstein hd's all around w mm iso's. Car doesn't sit so low now, has a nice raked look, and I went out of town these last two weeks and took the Cobra. Drove about 750 miles on the new set up. Zero issues with rubbing now. Car also rides a lot better with the new bilstein and h&r springs.
I hope so, my rubbing only happened when doing a hard pull. Seems hit or miss. New shocks are in, but roads are still dirty and salty.