Do you have one you would recommend for my current system and sound goals?
I am deeply ashamed (not really) admit that the best one I have heard to date was a Neardost from AliExpress. I had used two or three other cables before that, but when I put this one in the mix, the clouds parted and the sun shined. I understand if you don't want to go that route, but if so I can give you specifics. Alternatively I was recently given a recommendation to try the Acoustic Zen MC2, there are some good deals on the used market for this cable.
I got into jazz about 15 years ago, all my records were bought ~ 10 to 15 years before that so all my jazz physical media is on CD.
I started listening to jazz seriously about five years ago and have been improving my system to get more of the same instrumental information that you are seeking, and have been fairly successful. Maybe try something acoustic on vinyl to see if it has more of the feel you are looking for. Sorry to belabor the point, but your situation is somewhat confounding given the quality of your equipment. It reminds me of the sound of my early, jitter-rich digital system compared to where it is now. So, trying to eliminate the digital entirely and see if you hear more of the instrumental details you are looking for in the analog world, which would narrow the focus of where the problems live.