I have had the same volume issue with an Audible Illusions Modulus 3A. The problem - as several others have already noted - is simply too much gain (the M3A puts out 28 db). I was not aware that this was something I needed to consider when I bought the preamp quite some time ago.
I’m currently waiting for a semi-custom preamp from SMc Audio which will be set at unity gain (0 db). This should allow me to use the full range of the volume control with finer increments throughout that range.
Perhaps attenuation will work well for you. If you do decide to change preamps just make sure to pay careful attention to gain within the general environment of your system.
Good luck!
JJ