I've had a look at the focus test charts posted. All are significantly cropped, and in none of them is the chart aligned properly with the camera. There's clear distortion of perspective - were everything aligned properly, the lines would taper evenly towards the horizon. The test chart also doesn't fill the frame, which it should.
I presume you're using the centre cross type sensor? It is quite large and may be picking up more than the central focus point.