Hi Matt, I suspect that the Merril Element 118 class D prototypes might be a little less demanding of your AC than your class A/B Burmesters.
Even without their final Power Factor Correction (PFC) circuits, secondary regulators, and various other proprietary subcircuits still to be integrated, the amps should achieve an efficiency of at least 75%. Once the devices are finalized, efficiency might eventually reach somewhere between 85% and 95%.
This is not to say that Element 118 monos won't benefit from being each fed through a dedicated line to maximize isolation, and minimizing cross-talk, noise, etc... But depression of transients and low level detail might be less of an issue than with your Burmester amps sharing AC circuits with each other or with your line level components.
G.