At $75K I would assume that your signal chain is higher res than average. Also, since the LP playback is the outlier, perhaps there is some incompatibility between your stylus and the cutter head, or maybe you need to play with SRA, azimuth, VTF, etc. If your tonearm doesn't have adjustable VTA, it could be as simple as adding a thin turntable mat on top of your usual one. It's generally known that one can get a somewhat richer, lusher sound with a *slightly* tilted back tonearm.
What in the world is going on.....
My system cost about 75000 dollars or so. I got the rave review LP of the new Paul Simon album.....sounded pretty lousy. I listened to the included M3P download using AirPlay through my Denon receiver and Senheisser wireless earphones, and it sounded wonderful...... What in the world is that all about....