Best choice for AC power cord for Unison Research S6

Hi and Happy New Year !

I have the S6 valve built-in amplifier from Unison.
Now I use kind of "cheap" TMR power cord, which works amazingly good from all points of view.
I tried Oyaide Tunamy GPX-R V2 and DH Labs Silver Sonic Red Wave AC. Neither of the two mentioned models, works as well as TMR.
I am interested in finding the right version for the AC power cord, if anyone from you discovered it. Could you tell me your recommendations ?