I've used my Classe CP-35 as a preamp with my sensation and Two.2 with no issues so I figured I'd check into its gain.
it looks like the phono pre in it makes 42db and the line level gain is 18db
I think you'll be fine at 23db, I cant get my volume to 50% on the preamp using my Classy twenty five, VSP labs trans mos or Sensation so I dont think you have anything to worry about.
I dont know why they make such high gain preamps, my passive pre does just fine