This magazine is a source of no-nonsense car tuning advice for AutoX and Roadracing. One of their current projects is an H-stock auto-X Mini Cooper. It's been hard to find good suspension tuning advice for these cars because it's not until after 4 years of production that a car can compete in the SCCA Improved Touring class that allows suspension modifications. So I can't yet find any info on spring rates. However, this article gave recommended toe settings, which is a big help ( Don't use these settings on the street unless you're prepared for your car to over-steer ).