Help me be sure I understand exactly what the issue is here. There seems to be a contradiction when you say your images are consistently back-focused, yet the calibration for micro-adjust indicates no adjustment necessary.
When you say you "focus on the eye," are you doing this manually or with AF? Other posters are right when they say AF-ing with the center point and recomposing can lead to incorrect focus. I am constantly re-selecting a focus point manually on my 7D so the AF point is right on or as close as possible to the point in the image I want in focus. On the other hand, if you are critically focusing manually and getting consistently mis-focused images this may suggest something else.
As an aside, this may start a debate, but I think AF micro-adjust should only be used as a stopgap to get you by until you can get the camera and lens to a service center for repair/adjustment. It's kind of a blunt instrument and you may correct your focus errors close in, but then cause problems with focus on more distant objects, or vice versa.