Did you try the UCD modules with batteries? I been playing with SLA powering a pair of UCD 180s. At +/- 36VDC they sounded very good but not significantly better than with a conventional PS.
But when I tried to run them off +/- 24VDC, WOW! This is something special! Fast, clean, open, tons of resolution, and reeeeeelaxing. I can feel the stress draining from my body when I listen to music through this amp. But the most important thing to me is that they don't make my ears ring like every other digital amp I've heard. My vintage VTL and Quicksilver amps are bummed out at being demoted to second-string, at least for the moment.
The down side is that at 24V the UCDs run out of gas a lot sooner. I know I'm getting much less power than the rated 90wpc. But in my biamped setup I'm able to get away with it for the most part.