Hi Phil
I just thought about a few other things.... based on practical experiences with extremely difficult speakers in difficult room... (Duntech PCL-15 in tooooooo reflective room)
What worked for me in such a situation is:
To move speakers as close to listening position as possible, provided better imaging and better soundstage
- You will hear more of the direct sound from speakers and less of the reflected sound and less from the room
- The front wall will be further from speakers, so the influence of front wall may be less bothersome
- You get less room boundary reinforcement, may end up with better upper bass, depending on speakers, you will lose lower bass, but that's no issue whatsoever because you have two subwoofers....
In some occasions I have seen people adding diffusers extremely close to the speaker drivers to tame very difficult rooms, especially narrow rooms, actually we're talking diffusers not on the wall but onto the speakers. I have never tried this myself but sometimes this is suggested to work in difficult rooms.
I suggest you try moving speakers around a bit without doing so much with Audyssey settings until you find something good, and then try remeasuring and perhaps move and remeasure.... That sounds like really hard work and it probably is.
My experience is that the hard work of finding better positions for speakers is very much worth the effort, and room correction doesn't change that so much, because there are many things room correction cannot fix...
Suddenly when things get right, voices ge cleaner and more realistic, suddenly Bruce Springsteen is there in the room.........
Good luck !!
-Harald