My criteria is mainly acoustic parameters and factors on which i can act as did your "friend" Edgar; not double blind test ...😊
I learned to trust and trained my ears enough to do a minimally satisfying job... You said yourself that you dont trust your own ears without double blind test ... Is it not comical ?
By the way i am pretty sure your system is minimally good at least, not because i trust the ears you did not trust yourself each side of your head , but because your own the set of filters of your "friend" Edgar ...
😊
On a side note, I’m not sure you have a very accurate and complete accounting of my criteria for judging audio