Originally Posted by
DaveLeeNC
ps. The actual width on my 23mm 4000s ii's is 25.5mm.
I was going to mention that. Conti's run notoriously wider than many tires (as you indicated almost a full size). My understanding (perhaps incorrect) is that the rounder profile of the tire should give a larger contact patch and a smoother ride at higher pressures vs. a "taller" tire. Aired down even more so, and at 160# you shouldn't be worried about pinching.
Honestly, I think you're chasing vapor. I'd keep airing down until you've taken that as far as you can.