Jeremy:
A couple of questions:
1. How do you deal with the upward travel from 125mm of sag? Is there rebound valving work that needs to be done as well? Maybe a top out spring in side the shock?
2. Isn't the middle of the linkage curve a little flat to get firm low speed damping without the high speed spike at the end when sitting down an extra inch or so?
I had a nightmare of a time with my "flat to steep" linkage curve last winter (94 YZ250). The new linkage I make from the Devol print completely solved my problem without the need for any valving work. What you're proposing seems as though it would only use the concave part of the linkage curve, effectively. That is exactly what the newer linkages for standard bikes have all gone away from. They are now all set up with a convex looking curve in the first 3" or so of travel, then flatter, then ever so slightly concave toward the end. It seems quite difficult to work around that with just valving.
Trade secrets aside, what's your concept there?