Hold on here X, you measured your viscosity without mixing it? I re-read your post a few times and still see the same thing, you only checked the PAINT, that viscosity recommended by the manufacturer is mixed and ready to spray, so your results mean nothing, not one single thing.
I have never seen the term RTS on anything other than a 1K product that was LITERALLY ready to spray out of the can. By definition "RTS" means there is NOTHING to be added. So if Valspar is calling a product that needs a hardener "RTS" they are going to confuse a lot of people. There are plenty of products from IMRON to clears that are "prereduced" and you only add the hardener in a let's say 4:1 mixture. Are they saying these products are "RTS"?? NO OTHER manufacturer calls a product that you add a hardener to RTS, does it actually say that on the can or literature?