Hey john you should invest in a good wall mount that extends off the wall!!!
The one i have pulls a full 27" off the wall, that puts you a full 2' closer to the screen. This would make the size of your 55" on the wall now like a 60". I think what makes the tv look small is that it is a little too high above your center channel. Maybe lower it just 6" or so.
Just a couple friendly ideas!!
Looks really nice in there though! I bet your lovin life when relaxing in there