To completley change the direction you're going, why don't you put your TV along the short wall in your room?
This would be amuch better setup than you have now in regards to seating distnce from TV and in speaker placement. It would probaly create a much wider, and possibly better soundstage than what you are going to experience in the current setup. You would also to be able to position your surrounds in a mcuh better spot, slighty behind and above your listening position.
Just something to think about for you.
