I have a similar problem, as do many, many others (I'm sure). This is a fairly common WAF problem and not so easy to deal with. My solution is going to be putting in cieling speakers, with a tweeter pod that can be angled to fire at the back wall behind the couch, giving me some dispersion. I don't know if this is going to be better or worse than what you have, but so far it's the best I can come up with.
Good luck,
Bob