Thank you again to all that have offered me input on this.
@twoleftears for the moment I will single out your reply as I can answer these questions with concrete answers:
There are two issues here, does the volume pot have an optimal operation range (typically around half way between min and max), and does the way the volume pot operates at the moment give you enough fine adjustability to hit exactly the volume that you want to listen at.
#1 That would be about twelve o-clock, and if I put it there with anything but low level recordings, it would be blasting me out of my small listening room. It would be LOUD.
#2 Yes, I can find a level that works for me, but it gets there quick. As previously typed, usually around nine o-clock with some + or - depending upon the level of the recording.
After reading through that revived SLP05 thread, it made me wonder and inquire if the same volume would sound better if I was obtaining it at a higher setting of the volume knob. In other words, would my desired volume have a better sonic quality if it was achieved with the volume knob set to twelve o-clock or more as opposed to nine o-clock.
@russ69 when you say that an attenuator "will drive the preamp harder," is the bottom line that this is what I want to do to achieve (at least "on paper") better sonic quality?