I tried moving my head off the headrest and got nearly the same results.
I noticed that the Logic 7 processing widens the sound stage of a mono recording, but it seems to narrow the sound stage of a stereo signal.
I did try adjusting the balance control of the processor to make the speakers more balanced.
I can try moving my head more towards the center, but that would throw off the time alignment of the drivers.
I do have the rear door speakers set to the side speakers like the manual recommends. Would I get any better results if the rear speakers are set to the rear and not the side?