@swede58 , glad to share my findings. In 2019 I also tried a Valhalla 2 power cord from Nordost. I found that I really enjoyed the sound of that cord, so much so that recall staying up all night listening to music. But I ultimately found that it had less bass than the other cables I was testing at the time, and I couldn’t live with that.
I do however have Valhalla 2 speaker cables that I use with my Diablo, which I preferred to other options due to how fast and how revealing they are. Bass is definitely not a problem with these cables. Having had these for a year, they have been a blessing and a curse. They were so revealing that they exposed AC issues that my houses power had with massive improvements after midnight. A common predicament but one I hadn’t noticed myself until the Valhalla 2 cables, This launched me down a path of many upgrades last year, including installing dedicated AC circuits in my house, along with a USB reclocker, audio network switch, and new speakers. And while I addressed the issues and my system can sound really great now, my system has become even that much more revealing, and is now hyper sensitive. Just the slightest changes makes it sound not quite right, I now notice component warm-up on occasions where power is cycled, etc. I sort of miss the days when I didn’t have to make sure that everything in my system was always set up just right!
Of note, @jays_audio_lab on his YT channel recommends the Dragon power cord for Gryphon amps (although he has tested all the much more expensive ones than the Diablo!).