Like Sean said some progressive springs can be a pain. My pro-kit rears were 80-130# and would switch to 130# at about the same time the rear axle contacted the bump stops. So you would see a sharp increase in wheel rate all of a sudden. This made my car almost snap oversteer at times. The tail was a lot easier to control with linear 125# rear springs and no other changes.
I'm convinced that switch if made earlier would've made a big difference in some events I ran this year. I know of one in fact where it helped tremendously with putting power down in turns.
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