Just got done re-tweaking things, and I have a confession to make…
I was
CERTAIN that I could not be happy with a 2 channel music only system, where the subs weren't 'inline' with the mains. Even with the time previously spent on getting them properly sorted out in the room for the HT system, I could not imagine they could be seamless with a system that was oriented 90 degrees out, a system where the subs would be closer to me than the mains.
I was wrong.
I swapped the cables around, and fired it up. I messed with gain a bit, played some songs, and was "meh" about the whole thing. It just wasn't coherent. With a proper gain on the subs, there was too much bass coming from the left side. Turn the subs down to where it was more blended, and it was like they weren't on.
Then I gave up, pulled out the mic, did a quick level set, and ran Audyssey. WOW… Just wow. The system is balanced, smooth, tight, focused, etc., etc., etc. The delay and phase calculations Audyssey applies did the trick. All I've done is bump the sub out level on the Denon down a half db, and I am HAPPY!

Is it perfect? No. On the really deep sections of certain songs, you can tell it's biased to the left. But over all I'd say 96-97% of the bass I'm hearing/feeling is centered, you might even say 'tied' to the mains. I'm so satisfied, I pulled the sub I was using out of the room all together. Incredible.
You guys are the best. Not only have I saved money by not doing an upgrade that may never have worked, but I now have an extra sub to use elsewhere (or sell).
THANK YOU!!!