Hi Bob; As I recall, the shock only has about 1 1/2" actual travel before it hits the bump stop. The rest of the wheel travel is due to the linkage setup. Don't forget that you bled nitrogen from the shock. That gas helped to not only keep the oil from foaming but also added a progressive resistance inside the shock. Standard pressure is 145psi.
Progressive Suspension has a great suspension book, The Suspension Bible, that I found to be most useful in understanding all things suspension related. Many of us consider suspension to be a black art. If you break it down into the various components it's easier to digest.
https://www.abebooks.com/Race-Techs-...IaAnZOEALw_wcB