I think that there are plenty of guys around here that care more about testing while blind, than they do just enjoying the music. Many also seem quite interested in NOT hearing differences, while "blind". Just my opinion. I've found that it's more important to learn to be happy with your system as is, than to constantly try to "improve" it. Actually improving performance, in the areas you want, is very hard and time consuming. It will drain your savings account dry, too.
It's much better to enjoy what you have. A friend of mine was driving himself crazy for a while. He'd be elated one night, and frustrated the next, all because some recordings would sound terrific to him, while others would make him think something was wrong with the sound. It frustrated me too, because nothing I said seemed to make any difference.
I mean, I go through periods where I feel like, if I could just buy so and so, the sound might be better in some way. Then I audition it, and it doesn't get better, it just gets different. It even usually gets worse, overall. This hobby can be a serious thing, an obsession. There's an old saying from the Good Book, "all things in moderation".
It's a shame that this hobby flys in the face of such an ideal. Sometimes, you have to take stock, I guess.