I have the K&W's right now. The spring rates on the car are (If I remember correctly) 640 front and 450 rear. Not so sure about the rear and quite sure on the front. I'm able to get just about any spring rate from K&W but going any stiffer would ruin the ride on the street. However, I am considering going stiffer. My biggest priority is to lower my IAT's and ECT's. I've made progress on the ECT's but the IAT's have gotten worse.
A few statistics from the race:
Faster than every Honda
Faster than every Subaru
Faster than every VW
Faster than every BMW
Faster than every Porsche
Faster than every Ford
Faster than every Chevrolet
Faster than ..... other stuff that showed up.
Modified well driven GTR's aren't sweating.
Atoms aren't sweating
EVO's are sweating
The rest are chanting "were not worthy" or wait till next time!

My GoPro took a wonderful video of my driving technique but you can't see anything outside the windshield. So, it's going back to where I know works. And I'm going to work on what the video showed that I was doing ..... incorrectly.

Les