The answer is it is possible to have speakers that are too large for your room but that's not your problem.
Place them along the length of the room instead of the width. Place the back 2 feet away from the front wall, space them 9 feet apart and sit 8 feet away on the diagonal. Treat the first reflection points on the sidewalls and floor at least - ceiling if practical.
Mojo, you did it! Today I rearranged the room pretty much as you suggested. I was here a few months ago, but had less furniture in the the room, speakers closer together, and before the DD-BluOS module. Right now I'm listening to Pink Floyd Dark Side of the Moon. Beautiful! The reflection points are pretty much neutralized by the fireplace on the left and a soft armchair on the right. I'll post a couple of pictures tomorrow to show you all the difference.
Thanks all my new friends here! I hope I can someday return the favour. "That Great Gig in the Sky" is calling me to pay attention.
