@howardlander
Wireworld and Cullen C7 cables provided an upgrade in sound; deeper bass extension, wider and deeper soundstage, and increased detail. The Wireworld is more detailed than the Cullen, both gave the Node more weight to the music.
It’s great you have a dedicated line, but this mainly removes noise from the appliances and devices in your home, providing a lower noise floor to your audio.
The power supply in the Node is very small and comes with a cheap PC. A cable with pure copper and high quality terminations will make a noticeable improvement. It will feed the Node a cleaner signal vs. stock.
Try a cable from a dealer with a return policy.