+1 on the heavy window drapes, you'll appreciate having those for some privacy when you have lady-friends over. I know a lot of women who don't like strutting around with such an open view. What I'd do is this : Buy a drop down screen, get rid of your TV, get a projector, and change the orientation of your speakers. I was a huge fan of B&W until I was about to buy the CM9s, and I got some Klipsch THX Ultra 2s instead, which in the end, I think neither were the best for me, but I had a much bigger place than I do now, and I really think you need to listen to your ears telling you, if your smaller speakers sounded better, put them back in!! Save the money for some nice scotch! Sure, the CM9s are beauties, but short of moving to another place or putting drapes and carpets everywhere, they will probably sound like teh suckage no matter what you do. In fact, I agree with most people here, if your room is the culprit, then NO larger speaker will be well suited. Who knows? You will, once you try. I'd try a few more bookshelf speakers and set them up on the walls, with a decent sub.
Also, one comment here about missing the center and having to pump your volume to hear anything, that's exactly the behavior you get on a system configured for a center that isn't there, you can barely hear the voice because some of it spills over into the left and right channels in the mix, so, what I'd so is leave one on left, and the other as the center, and try that. If all of a sudden you hear voice well, then that's it. I wouldn't do any fancy EQing until I got the basics down. My Kilpsch horn tweeter blew and I thought it was my receiver not being able to drive it so I got an Emotiva, solved everything. I would return the CM9s for another pair, AND try another more powerful amp (very important, trust me one time when it was my fault that I blew my compression driver, was because I tried running my 4 ohm speakers on my Marantz because my Emotiva amp connectors had been bent off by accident and it was a party situation that I couldn't forego music). Anyway, if you can still return / exchange, do that. Definitely get some acoustic treatments, panels, a carpet, some drapes, no matter what speakers you get. Good luck man!
ps nice doggy