>Currently breaking-in 3 Shunyata power cords,
So you already bought them. I would have took two different cords for the same price $375, one more expensive than the other, more like $150 and $225, and trieng them in different locations, on amps, dacs, transports. Cords ACT differently in different places. But bringing "signature" character is common.
I have put my thoughts in the other thread.. played with Diamondback, Copperhead, Taipan Helix Alpha couple days ago.. I found Daimondback not very interesting cord, yes noise floor lowered a bit, bass got more punch.. but I found this very subtle, really not worthy, and instanty wanting to go one level up.
Interesting things happened with Copperhead, which widened the soundstage (kinda loose imaging, though) and gave base huge and most importantly NATURAL feeling slam. Thats was on DAC. Then I decided to bring back imaging, so Copperhead fit nicely on amp, maintaining wide soundstage, + SLAM. And then I brought back detailed precise imaging by putting my favorite DAC cable Kimber PK14 (ordinary, not GOLD version!). This way I felt the power cord loop was complete.
So my suggestions - always get at least two different power cords...so you be able to COMPARE, search for positions, and have more FUN.