Best Power Cord for Bel Canto Evo 200.2

I was wondering what other's experiences have been with different power cords used on the Bel Canto 200.2. What are the best cords and what did they do for the Evo sonically? I have two 200.2s in mono-configuration. Currently using 8 ft Synergistic Research AC Master Couplers. Preamp is Sonic Frontiers SLF-2 with upgraded caps from SF. Speakers are Talon Peregrine Xs with the latest CMRC upgrade (aka Mark II).
I own the Mono evoe 200.2s and settled on the TG Audio SLVR. They add more bass than the HSRA GenII and the midrange and highs are even more open. If your system has brightness, they won't cover it up and you could try 688s instead. I tried Elrod 3 standard, kimber palladium, taipan, foundation research, empirical magnum2, elrod standard, audience power chord, audio magic illusion etc.
Thanks for sharing your apparent considerable experience trying different power cords with this amp.