[Jeff Lee]

I'd be hard pressed to identify a situation where you want the compression at max stiffness on a double adjustable rear shock. Try it in the middle for compression.
On extension, start in the middle and progressively adjust towards a stiffer setting. Bad tracks need the extension softer, great tracks can take it stiffer.
Once you have the extension figured out, then you can work on the compression.
But no matter what shock valving you have, get rid of those 26" slicks! Taller is better.