Hi Sam,
Thanks for your comment and I'm glad you also found this effect. I Audio Quest cable made zero difference on my MC452 or my Parasound JC5.
Based on someone's comments, I moved it to my D90SE. I'm doing the power supply upgrade to my node2i and that will allow me to try a better cable there.
I might purchase a second Audio Quest power cable and move it to other equipment like my preamp.
I thought I was done tweaking now that the pandemic is over but that initial power cord move showed that there was still more left on the table.