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I haven't, but we have a lot of furniture in this room and a very large rug. I've done the clap test and it's surprisingly quiet in there. Versus my other rooms, anyway, which are noticeably echoey.
I've been thinking of getting some stuff from GIK but it's a bit tricky to figure out what might benefit me the most. For example at the first reflection point for my right channel, there's a book case full of books and on the left channel, there's a room-length sized window.
I think your tv has some dead pixels....
Seriously though, looks like a great setup. Have you investigated any room treatment or anything?