Jeff,
Simmilar results, I have clearance at 75% EPA with 100% dual rate, but have never needed more than 50% to have too much steering. I was answering Arvin, who was concerned about throw.
On the tyre issue, I have Parma on the car now with the stock tow out shims on the back, and I think I may be over 190mm, but it might squeeze into a tech box. Probabl;y the offset.
Jim D