Eh, those DefTech 55's aren't really a smiley curve -- remember that stereophiles measurements don't include baffle step correction, so the bass is shown about 6dB higher than it actually is. Likewise, what happens above 10khZ generally isn't going to matter much, especially if Destination:Moon says hearing is affected above 4khz!
Hard to compare really; the DefTechs are just much more uneven so certain frequencies will stand out, others won't. It's an interesting case study though. Without meaning any offense, it should be noted that the greater the hearing loss the less reliable measurements are an indicator of performance, something I often think about when it comes to certain audiophile markets. But it could also be the DefTechs just suit you more for whatever combination of reasons. It happens!
I totally get it. Having impaired hearing has got to affect my perception of audio gear. And it's probably true of everyone. I doubt that most people have linear hearing curves.... No matter what your hearing range is.
Funny thing is that I appreciate music just as much as I ever have. Maybe more now that we have COVID and a lot more time to have listening sessions. For me, it's not so much that I notice more or less of certain notes or tones in the music. Although that is certainly obvious comparing them. What separates these speakers for me is there spatial imaging. It's getting that 3 dimensional feeling that the band is right there with you. It's a fine detail but very apparent in our room that some are better than others in this regard.
Thanks for your feedback on my comments. It's interesting to read your thoughts on why things sound the way they do. I'll probably give them another round of comparison before making a decision on them. I also have a pair of Affordable A+'s that I'll compare them to.