Let's call a a spade a spade- your room is very difficult due to its shape. When I was there, it was on the cusp of being overdamped and since then you've put up loads of treatment (David Karmeli actually found it overdamped while empty!). The room had a massive node at 60 hz, which is not something you can easily treat away and required a lot of speaker placement experimentation that you were hesitant to do because they weighed a lot. (I would be remiss to forget that the Gryphon brain trust came over and floundered on that front as well). The room notably doesn't include any diffusion (your records/tapes are in another room, the wood paneling is flat, etc.)
So where has it gone since. Well, covering your room in panels, AVAs, "Resnick tube traps" and other stuff isn't likely to solve the problem coherently, and I really don't bow to any recording engineer in designing 2-channel audio rooms. JR, another expert, brought out a bunch of laptop programs and measurements, but seemed to have not been successful as the Gyphons have suddenly disappeared although you haven't taken out the woofers (which of course are affecting your sonics). As I recall he also ordered the use of carpet tiles and the upper side walls toward the ceiling. I would think replacing the blinds behind you would have been a pretty easy test for all those microphones.
Your original plan had 1 designer in Bonnie but now it's a cadre of Karmeli, Don, JR, the guy who recommended the AVAs, Mr. Recording Engineer, and Art Noxon (who has awful sounding rooms, sorry). In short, a hodge podge of non-congruous room treatment options and materials. This entire "OMG i have (treated) glass windows 8' behind the listening chair that still may be doing something bad" just sums up the predicament.
I've mentioned since break-in (and on this thread almost 18 months ago), I'd hire Stirling Trayle or Gary Kuo to setup your speakers as a 4 column speaker is very complicated, it would take the room as much out of the equation done correctly, and minimize the treatment required. Otherwise, you are just moving from one perceived problem to another. That is as holistic listening isn't really happening. Alternatively you can revert to Bonnie or someone else to come up with an entire room plan.
But hey, its your room man. You deserve to get SOTA from that significant gear investment, but you haven't arrived yet.