It reads like aesthetics is kicking your butt. I do understand and fully hate it when that happens.
Working with you, in my opinion, not having seen your room, going off of what you posted in your above, on the back wall, two SB12-NSD's under the end tables (near-field placement) and the Epik, Empire on the left wall would be the best option. And then, to the best of your ability, use REW to fine tune any AVR provided, auto-EQ system you might have.
(personally, I think the SB12-NSD's have something special going on)
Edit: I may just be wasting everyones time here. I did some quick measurements and I was WAY off on the cubic feet. More like about 6000-7000 than 4000-5000.
(with the above addendum, it reads like you're back to finding a way to slide a PSA, XS30 into the room.)
It's beginning to read as if you're going have to go big or do without. What are your subwoofer expectations? Are you wanting to impress the neighbors, three doors down or are you simply wanting some decent levels with some headroom?
If you go with a pair of SB12-NSD, set under the end tables (near-field placement) with the Empire on the left wall, you really should get what you're wanting. If you're wanting to impress friends, buddies and the neighbors down the street, you're going need a lot more.
(I'm retooling my thinking as forums such as AVS will give one skewed values)