Up front I have run everything from 525lbs up to the 750lbs. I run one really bumpy track often (like NJ roads bumpy) and I dont find the 750lbs front too stiff. My current set up is 750/850. I think the biggest change I made was lowering the gap in rate from front to rear. With all my previous springs I have run a 125-150lbs gap from front to rear. With lower the gap front to rear I found I eliminated a lot of under steer.
edit.. forgot to mention i am not running a rear sway bar any more but have a bigger GC bar in the front running pretty close to full soft.
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07 Z4 M Coupe AW/IR
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