@bigtwin You put out all that money to run with Puritan Ultimate power cords throughout your system. And after making your own $60 cords, you can't hear a difference to the PU cords? Did you not do any serious listening / comparisons of your stock power cords to the PU cords before you invested and committed to PU? Sounds like the PU cords are not so Ultimate after all.
You heard no difference when used into your amplifiers. Here is one experiment for you to try: at the Soundlab speakers......yes, the speakers. I have been running with Soundlab A1 speakers for 20 years now. With all the refinements I have made the last 5 or so years, power cord differences are HUGE with the speakers, much greater than with my amplifiers. And the cool thing about this, there is nothing to power down here. Have two pairs of cords plugged into the wall, and you can change from one set to the other in a matter of seconds. If you can't hear a big difference here, something is seriously wrong with your system....perhaps the PU cords or other cables you are using.