So, I went back and read Kal Rubinson’s Stereophile review of your speakers and his impressions as well as John Atkinson’s measurements are both inline with what you’re hearing — that being a lack of energy/warmth from the upper bass and lower mids so I think replacing the speakers is a good idea. Also, having to place the speakers only 1 foot from the wall to augment bass is no doubt why you find their 3D soundstage lacking.
Here’s a beautiful pair of Usher speakers very nicely priced and should be a significant step up in virtually every way. They’re on the larger side but as long as you have the flexibility to pull them out from the back wall and a foot or so from the side walls with a bit of toe in they should be fine.
https://www.audiogon.com/listings/lisb8a96-usher-audio-be-20-full-range
Here are a couple smaller options that would also be excellent choices although likely with a little less treble energy than your PMCs project.
https://www.audiogon.com/listings/lisb86de-verity-audio-otello-full-range
Just some thoughts/ideas to ponder FWIW, and best of luck in your search.