Hi wideload, I have a similar room size and I also do have GIKs in my system. Check out my primary system page for what I have done. And the best part is - I also have a single chair in my room - no furniture. I would love to see your system pic, since it would be so similar. I am assuming the speakers are on the smaller wall?
Room treatment-I was afraid of this
There I was with a dedicated room-not ideal being nearly square and a less than 8' ceiling-and barely adequate music, not awful but the system had sounded better. I tried moving things about some with differing results but nothing satisfying. Part of the problem was moving from a 30x35 foot room with an 18' ceiling. I was used to the speakers being well out into the room, far apart and sitting pretty far away. I used the odd integer matrix method promoted by Vandersteen but hadn't considered either placing them closer to the wall or moving near field. Nick at GIK recommended both, as well as some furniture rearranging that made a very pleasant difference. That was all the encouragement I needed to order bass traps, 1st and 2nd reflection panels and front and rear wall treatments. Installed them by about 4pm Monday and listened until 2 am, back at it last night from 3pm-1am. It's just as so many have said, this is a serious component upgrade. It is matched in scale only when I went from Vandersteen 2CE's to Chapman T-77SE's. Not a single aspect of the listening experience that isn't enhanced. So now the problem; I suppose a lot of the glowing stuff folks make of cables, power cords, fuses, and on and on also make significant differences. How long can it be before I'm off and running on that stuff?