Sounds like springs aren't stiff enough. I would think specific rate is much better than progressive for racing. Is your car totally a track *****, or a DD?
I'd move up to something in the 800# range, 600# isn't stiff enough. I've got H&R progressives for my DD/Auto-x car, 700-760F, 275-300R. Those Steeda progressives sound like they've got an awful wide range of rates. I haven't got an opinion on my new set up yet, I've barely had it in for a day! =) No more events this year either! =(
From the guys I've heard from running Tokicos, they run 4 or 5 in front. Have you tried messing with the settings?
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