With regards to track width, the best combination I have found so far is 1.5/1.0 front and 0/3.0-3.5 rear, sometimes adding .5mm sheel shims to the rear in low bite. I was running 2.5/2.0 front and the steering felt inconsistent. Narrowing the front smoothed the steering out everywhere (15lb springs front and back). I measured my widths at the ends of the axles, and I think it came to 188mm front/185m rear (?).