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I have an 11' wide room and I went with a 92" screen. I have barely enough room to get my speakers away from the side walls before they start blocking the screen from the side seats. I would consider 100" or so (unless you go acoutically transparent and put the speakers behind it in the wall). My room is 19' deep (similar to yours). My rows are about where yours are. Front row is great for acoustics and response. Back row is much boomier because I put it too close to the wall. I didn't have any choice because of layout, but if I did I would have the rear row about 1 to 2 feet farther forward.
Good luck.
Good luck.