Don't know if you read my post earlier today..but I listen to a lot of music also. Don't get me wrong. I could move the speakers if I wanted to...but my friend and I have been playing with speaker positioning and room treatment for about 6 months and we were able to decouple the mains from the room where they now. We find our music reached it's crescendo where they currently are....so me moving them would be difficult if you know what I mean. I don't notice it when watching movies...only music which makes me think it could be off for movies and I just don't know yet.
Tracks I listen to all the time where I know it should be centered is off to the left side with what audyssey sets it at. Luke
I understand you are reluctant to move either the speakers or the chair. I understand your hearing is sensitive enough to perceive that the stereo image is slightly off-center with the distances set by Audyssey. You changed the distances so they match at 6.8ft, and you are now happy with the way the image is centered. So, the only remaining question to be answered is--did changing the distances adversely affect the calibration?
In my opinion, yes, the calibration is affected, but since the change is only .2ft, the effect is likely to be insignificant. You have a very nice setup. Enjoy your sound.