You don't have to go through the trouble. We can just respectfully disagree on the matter. I have my ears and you have yours. Personal enjoyment is all that matters to me. You continue to enjoy your amps and I will continue to enjoy mine.
I think that your statement "I have my ears and you have yours" is not correct, and that is the root of the disagreement.
The "output impedance" issue seems to originate from a web site where their concept is:
" You have your primitive unreliable ears, while I have superior advanced technology. "
They cannot seem to understand the end result of audio playback of music, is how it sounds to ears, and seem uncomfortable with the idea of making a judgement.
SO, to those people - if the output impedance is wrong, then it simply cannot sound better, and your ears must be wrong if you think it sounds better...
BTW, this new technology worship - to the point of self-loathing - is a fascinating psychology topic... which would unfortunately be off-topic in this forum...