Hi John,
We mostly use streamed sources (Qobuz or Tidal) in demos at dealers and at shows. Even with standard resolution files we find streaming can provide excellent sound. Your system is also beyond reproach, I have heard those exact components delivering outstanding sound in a number of different rooms around the world so I personally doubt that either the system or the source is the culprit here.
Poor soundstaging points to room and/or setup problems, as alluded to above. I have a combined living/room listening room, which while quite a decent size, doesn’t offer a lot of flexibility in set-up. I have to have a sofa between the speakers and while one long side is lined with books the other is covered only by a large painting so it is very acoustically “asymmetrical”. Not having a lot of scope for physical room treatments I opted to go the Digital Room Correction route and have a custom FIR filter which I run on my Roon Server which evens out the time domain of my room nicely. (see my New Kid on the Block thread for more). The difference it makes to the sound staging is huge, it also significantly reduces my two worst bass nodes which makes the low bass much clearer and improves detail and texture across the whole bass range.
As others have noted, speaker positioning, even changes as small as a half centimeter, can make huge differences. So it might be worth having someone go over the setup of your Sashas and just check they are optimally placed and dialed in.
Finally, you mention a lack of warmth. Warmth is typically associated with even order harmonic distortion, for instance the sound people tend to associate with tube amps. Although dCS equipment is generally known for being pretty tonally neutral, as are d’Agostino electronics (although the Progression M550s generally sound a bit more “fleshed out” than the original Progressions) it may be that you are simply accustomed to a different sound ideal and that a tonal balance on the warm side of neutral is your preference? So maybe it is worth thinking about your sonic ideal, the system or systems that you’ve heard that delivered the ‘warmth’ or ‘emotional satisfaction’ that feel you are missing and how they differed from yours. That might offer a clue.