Mcondon
Honestly. inproving upon the transparency control, and dynamics of the MC 275 is easily done by going with The Butler TDB 2250, or better yet, the Dodd 120wpc mono blocks like the MK II's or later. both are more affordable than the new Moscodes. Both IMHO outperform the MC 275.... I have a Mac dealer in town... and why I now own both Dodd and Butler amps instead of the MAc.
That said, I do really like their SS amps, 402 & especially the 602. I feel the 602 or 500 wpc monos are life time amps. Really no need to go anywhere from them... in SS of course.
It's good you are digging the Mac amp. And discovering various iso gizmos very well can & do contribute to altering the sonic product. A Nice amp stand or small tuned rack from someone like Sound anchor will still further elevate the audio presentation... or such was my own exp. I have both amp stands and a towering 6 level filled rack, from Sound Anchor. Couldn't be happier with either. Also a pr of tall speaker stands. All helped improve coherency and presentation imaging.
TC