Thanks. The diagram helps me understand your situation much better. Below is what I would do. There is no need to angle the left QS8. Just mount it flush to the wall just as you would the right one.
I understand your concern about the door possibly doing damage if you move the right QS8 toward the back of the room a bit more. But, since the optimal position for the surrounds is slightly behind the seating area, if at all possible, could you move it as far back as you can, and use some sort of adjustable hinge mounted, floor mounted, or wall mounted door stop to prevent the door from striking the speaker?
Even if you can't move it back any farther, the 2 foot difference can be offset by proper calibration of the volume settings for each surround in your receiver.
