I think something I said got lost.
I already put my shocks through the floor because that's the only way to get a long enough shock for my travel. I'd just be installing a second set temporarily into the stock location, to get a feel for what numbers I'll need. If I throw in another set of 255/75 at a 45, I can just cut those numbers in half and add them to my existing shocks, for a total of around 382/112. It'll take me all of 10 minutes to bolt up and test, cost me nothing, and I'll know from this, roughly what 380/110 valving would feel like. From there, I buy real shocks and set them up a little stiffer or softer depending on how it rode. Just takes a lot of the guess work out by having two sets of numbers to work from.