Still, if you know of a hi-rez, well focused power cord to the warm side that isn't foward and might take the edge off of a hot midrange (horns, piano, and some guitar on already hot recordings), please advise.
I don't think that such a thing exists, not because the sonic characteristics you are seeking are contradictory, but because, as Stanwal stated and you acknowledge, "everything is system dependent."
And also because the sonic differences between power cords can be expected to be subtle, elusive, and inconsistent, even as judged on a specific system, depending on line voltage, noise conditions, on-going aging of other system components, source material, seasonal temperature changes, and other variables.
And finally, as Mapman asked, "how do you know that a different power cord is the solution?"
Regards,
-- Al