Well, after some experimentation and moving my old diffusers to the sides and rear of the room and placing the new stuff where it sounds best (so far, this is where things are currently - forgive the crappy cropping - need to clean the carpet in the room and I'm trying to hide a few stains
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The acoustic panels are barely visible at the first reflection points (hey - that's the widest angle lens I've got and I'm shooting from almost outside the room) covering part of a sliding glass door to the outside on the left and a sliding glass closet door on the right (ah, to have a dedicated room...... sigh, someday perhaps) and the diffusers on top of sideways doubled up 242's. Everything can be removed, but mostly just for HT - the "screen" is the slightly grey portion of the wall - next purchase may be a screen that fits between the Super V's and comes down to the top of the X-Voce. (yes, LS6's next to Super V's - my "Frankenspeakers")
Initial impressions? Well, put it this way, I'm two days behind on chores due to extensive listening.
It's interesting hearing subtle (and not so subtle) changes as I move things around. This currently is the best compromise, but I will test further. It basically is a trade off between focus and depth at this point - the deeper the soundstage, the less focus and vice versa.