http://www.contour.org/FAQ/FAQ.php?s=specsThe SVT springs are darn close to the others. IIRC, they're just a hair softer than the early SE springs (or maybe the same?)
Remeber that the 6 has a dramatically different motion ratio than the SVT. Also, it's quite possible that the 6 and the SVT have a significant difference in the motion ratio... well, ratios, between front and rear. Thus these numbers might not really mean anything.
FWIW, I'm running 525/425 with a stock 200m front bar and Aussie bar in the rear. It's very balanced in low-speed corners, and works great for autocross, but gets hairy at higher speeds. Lifting at the limit at 60 mph will get the back end very loose, very fast. I've spun it trailbraking or lifting in a slalom several times on the autocross course.
