That would be an interesting test. That's what our last discussion in this thread was on though: ride quality. You attributed it to a changing spring rate or stiffened spring, i think it's simply the shock itself combined with the change in geometry of suspension.
At stock application the spring is compressed by the weight of the truck. Move the snap ring the displacement and spring rate stay the same and truck's height moves as a result. This is because the only force weighing on the spring is the truck itself once mounted. We're both agreeing in the method of lifting, just disagree in what causes this "stiffness or bad ride quality" people are complaining about at max height. Which it's beyond me why i'm arguing i actually quite enjoy my 5100s at max height lol. Take the 7000mt just like the 5100, both lift about 2", both use the OEM spring to do so. Yet it supposedly rides softer than the bilstein from the only review i've found. Now i have no anecdotal evidence to prove his statement. Take your ranchos and put them on the highest ride quality setting and tell me if it compares to the harshness of your old 5100s.
http://www.wranglerforum.com/f274/rancho-7000-mt-shocks-253720.html#post3939515
"The 5100's and 7000's are pretty much the same shock. Same type of valving, but to reduce the harshness that a lot of people complain about- Rancho opted for less PSI.
75-100 psi is a big difference as far as harshness.
Imo, If you "like" the 5100's. you will "love" the Rancho's"
All that said i don't find my 5100s to be rough of course some might. Do i feel my stock ranchos were softer on pavement? Yup sure do but they were just that: a pavement shock. Going off road with those things or even a bumpy road was pretty annoying.