OP,
Happy to hear that you got improvement using your new power cord.
Power cords to the amp can make a huge difference. These days power cords are customized to either low current components or high current. The low current ones emphasize noise rejection and the high current one’s emphasis low resistance for maximum power transmission.
I have been dedicated to high end audio for fifty years. I have a jaw dropping experience about a digital interconnect, analog interconnect, speaker cable, power cord, and Ethernet. The biggest over that time has been the digital and amp power cord. But all this is dependent on your components.
I spent over a year trying to get the power cord right on my amps. I tried many… WireWorld, DHLabs, JVS, Transparent, others, and Cardas Clear… pretty good, but ever so slightly impeded detail and overly warmed the tonal balance. Then my audio guy dropped off an Audio Quest Hurricane. Holy cow… what an incredible difference. I ordered one instantly.
FYI, I also optimized my component power cords (and of course interconnects). And the Transparent interconnects and power cords on my DAC, preamp, and phonostage have had a profound positive impact on my system.
Typically, a high end power cord and speaker wires can be the biggest improvements in one’s system. It would be really helpful to see your system. We can be of much greater help if we can see your components and venue. I might be able to recommend a power cord for your amp… but need to know what it is… if I have enough knowledge to make a suggestion.