Chuck may i ask what other pre amps you have tried with Boulder power amps?I owned a 2060 for several years until getting a Boulder 3060. I compared my 2060 to a lot of amps, tube and SS, and could not disagree with Alex more. So bring in all the amps you can to compare, play the most difficult, complex music. The quietness and control of the 2060 IMO really can't be matched, except for the 3060 of course.
I have used an Audio Research Reference Anniversary pre-amp for many years so maybe, as suggested, a different pre-amp.
Like you i enjoy the combination of valve pre, solid state power. It feels like to solution the the OP's situation as well, the issues he observes are the ones i feel come with using a solid state pre amp.
I'm in the process of upgrading to 2160.