scott22
First off, I do not yet have hearing loss; so no suggestions there.....and some good suggestions so far. I can see where a few tweaks could be helpful though.
(1) Equalizer such as the Schitt Loki or Lokius
(2) Since you cannot risk getting your "bread buttered" and cannot add room treatments (and that I can understand), some room correction could be helpful. Something from DSPeaker like the various Anti-Mode products
(3) Good cables between the CD and the amplifier. Interconnects like Zavfino Arcadia, Morrow Audio MA4, DHLabs Air Matrix, or Lavri Cables Ultimate Silver; can all be had for $200 to $300 a pair. The silver versions might be a touch higher, but may help with a bit more detail....which could be helpful