Hi Charles,
Been awhile since I've been on agon, but to answer your question about the different amps. The best sound seems to be with the Audio Mirror 45W set amps, just enough power to drive the speakers with most music and some great Vintage tubes. Used the N Core last summer and again now. More then enough power, organically detailed sound - very nice SS sound for this tube head. The 300B, although my favorite is used for a month or so in between the others - really at it's best with acoustic and Barouque. Enjoy all 3, and not a huge difference, seems that the Lamm pre and the speakers set the stage, so to speak.
Still a little envious of your setup though,...
Take care