I have a very similar situation as yours Bruce. My sides are in about the same location as to accomodate 2 rows seating. However, I think you need to move your rears closer together along the back wall, they appear to be to wide and close to your left/right surrounds, reducing the seperation you would want. just my 2 cents.

This is an old picture, but if you look you can see that my rears are closer.




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