All of this is quite interesting. In my room, I also have the sofa with the MLP about 6" from the back wall. We have Mythos Gem XLs for surrounds, which have dual angled mid-range/bass drivers. Since I can't do the classic Audyssey surround model, and I can't do wall mounts, I have the Gem XLs on 60" adjustable height Sanus surround stands. The speakers have been angled toward the MLP, close to two feet above the sofa, but not completely facing the front wall. Both speakers are LT five feet from the arms of the sofa as well.
However, while it 'works', I've never been completely happy with the surround bubble, which for more aggressive music surrounds can seem diffuse; if movie surround effects weren't good, I'd have spent time trying to work on it. And I've had other priorities with the subs, crossovers, etc.
So after reading Sanjay's post, and the one I found on Ask Ausyssey, I adjusted the Gem XLs so that the front of each speaker faces short side walls/corners, away from MLP. I then played some test MC music (with and without Dynamic EQ), and found that the front soundstage was a little clearer, and there was a more natural three-dimensional feeling to front stage vocals, which may back up Sanjay's and others' point. Also, background vocals and audience applause were a bit less jarring. The DEQ surround boost was still too loud, but to my ears a little less so. So far, the only downside is that a live, stadium recording sounded, well, more stadiumlike, but I'll test on movies tonight to see if it's an artifact of my test source.
This weekend I'll save my previous calibration, and rerun Audyssey Pro (with appropriate pre/post measurement of the surrounds, before and after Audyssey, with both positions) to see if there's more than a placebo effect at work. Granted it's not ideal, but it would be nice icing on the cake to get this better--at least until I can move the couch.
If I were really lazy, I'd leave the Pro calibration as is, adjust Sub db with the REW SPL, and do any adjustments in the Target Curve Editor (I like the mains and sub except for minor TCE adjustments or maybe PEQ), but "lazy" people don't use REW or obsess about 3 db dips LOL....
I was never really happy with the surround bubble and immersion until I switched to, initially, dipoles (Emotiva's terrific ERD-1s, no longer available) and currently my M&K SS150 Tripoles. The latter give the best of all worlds as they function well on 'direct' effects from the surround channels and also give a superbly diffuse presentation for ambience. I value the immersive bubble greatly and it adds a lot to my enjoyment of well-mixed movies, where sometimes subtle spatial clues and environmental noise contribute a lot to the feeling of 'being there'. I don't think I would go back to monopole surrounds now.