In all likelyhood, you are approaching unity gain with your preamp volume at 2 or 3 o'clock. This is a good thing. Try a preamp with too much gain and you'll hate it. Volume is too touchy for subtle adjustments.
As long as you can always get to a point that is loud enough, leave well enough alone.
As long as you can always get to a point that is loud enough, leave well enough alone.