I don’t have many aftermarket power cords left, but tried out an old PSAudio 12 gauge Lab cable, Wireworld Aurora, and a Cardas Golden Cross.
None improved things overall over the stock power cord, but in the interest of adequate gauge and ease of use, I’ve been making my own power cables , 4TC for source components, and 8TC for some class A smallish power amplifiers and a thousand watt plate amplifier for bass.
With some 8TC I made a 3 metre power cable for the Powerplant, and it’s doing something I never came across before- good stuff got better and the mundane stayed that way.