Hey, I might be full of something but what you suggested is not one of them; I take care of my body.
As to your claims, well, it is dubious at best.
Tell me which material, software, that demanded full power to all channels at the same instant? Be specific please. Speculating doesn't count
Then, tell me how you did your so called blind testing? Did you bother to level match to .1 dB spl at the speakers? How did you do this?
How many correct guesses did you get right???
And, since well designed amps, operating within their design specs, low output impedance are audibly are the same under DBT protocol, I'd say yours was flawed.
ps.
may want to read the 'All Channels Driven Fallacy post at the top of the page.