I think you put forth a very intelligent response, and make a lot of sense.
Although probably the most ubiquitous, 6922 based preamplifiers often sound less romantic and fleshed out to me than other implementations, and can lead to not feeling comfortable with the overall sound. Have you tried any 6SN7 preamplifiers? After hearing them, you may also prefer that type.
Also, a bit less conventional, but the sonic attributes you mentioned might lead you to try a solid state preamplifier. So long as you keep that Rogue power amplifier, you'll still enjoy the good things tubes provide. After going with the tide for a very long time that says tube preamplifier and solid state power amplifier, I believe the opposite sounds best, provided the match with the loudspeaker works.
Regardless of how you want to move forward, I think you can get a manufacturer or dealer to allow you to try their product without risk