and it occurs to me... as long as we’re talking measurements...
It might be fun, and informative, to go to a high-end audiologist and get ears measured before spending money on anything else.
I’d wager most people think they can hear more objectively than they can... and many of us would benefit from the best of the new hearing aids, myself included. I spent the best money I’ve spent in the past two decades on hi-fi gear when I got high-end hearing aids to help correct for my high-frequency perception loss: measurements showed me what I needed, and it was addressable by custom eq-ing the aids, kinda like room correction for the ears. Suddenly all my gear sounds much better now, go figure, and as a bonus my burning need to "upgrade" stereo gear has considerably faded... although my enjoyment of different speakers has increased! Indeed, my entire experience of LIFE sounds much better now! And high-end hearing aids (think Widex Moment, or Phonak Audeo Paradise) that actually make a big difference both to hi-fi enjoyment AND to life outside hi-fi is a smarter spend than a new expensive amp that would make a smaller difference and also be restricted to the hi-fi realm without addressing the actual issue...
I mean, as long as we’re talking about measurements... set ego aside and make an audiologist appointment: do you dare to do it?