Have you spent some time working with different spring pre-loads? Finding the right pre-load settings for the damping I was using on my JICs made a world of difference.

If you do decide on a new set of coilovers my new best friends (in the world) are the Zeal Function Xs coilovers I just installed last Friday - amazing ride quality and damping. They're not even corner ballanced or properly pre-loaded yet and they ride significantly better than my JICs did at their very best. I'm even using almost the same spring spring rates (8K front/ 10K Rear) as my old JICs (10K fron / 9K rear). Once the new Zeals are dialed in they should be an unbelivevable combination of ride and cornering. A big thanks to Adam at Z-1! Although if you're setting up for primarily track use I'd probably recomend going Function X instead of Function Xs.