What Power Cords Work Best with Audionote Amps

I have recently purchased a pair of balanced Audionote Kegons for my system and am currently using Isoclean Super Focus Power cords between the amps and the wall. The Isocleans worked superbly with my prior amps, but I am unsure whether they are the best match for the new amps. I have particularly long runs of AC wire so it would be difficult to find a dealer who could loan me cables of the right length. In addition to what the Isocleans do well, it would be nice to find a pc with a bit more extension at the top, better leading edge, tighter (better damped) bass, and excellent dynamics. Any suggestions would be appreciated. By the way, the Isocleans with a high power transistor amp achieve much of this but the requirements of a tube amp seem somewhat different. Thanks.

PS. I do not want to change the tonal balance.