Bob,
If the track is good on your first outing with the new shocks, start at mid-point on extentsion and keep going stiffer. I think your goal should be to see how stiff you can get them on a typical day at a typical track. That should be your baseline. In killer conditions, add to that baseline. In crappy conditions you'll be amazed to find going full opposite will save the day.
I'm re-valving my AFCO rears so that lightest extentsion setting will be 3 sizes stiffer than it is now with stiffest being +3 over what it is now. That should tell you something...
I could make a Viagra ad out of this...
Eric,
I have AFCO's all around, Cal-Track springs and bars. I can go 10.00's w/ 1.38 60' on the rear tires w/ 9" x 29.5 M/T's. That's a stick car which typically have slower 60 foot times that comparable a/t cars.