Joe B,
unstable is right - vibration is a major problem with these photo's. It could be that and/or a fact of the relatively high exposure time as these were taken in the late evening with
failing light. Also consider that the camera was pointing to the
left of the fuse (ie not staight forward/backward), and obviously
the plane is moving, so that could have had a distortion effect also.
As for the focus, I feel that there is still room for improvement.
It needs to be adjusted a little more for further focus. If you look at the second from last pic, the focus looks a little better than most of the rest. This pic was taken quite low down as the plane was coming in to land. I,ll see how the weather holds out today at my other flying site (a more interesting site, pictorially).
Texy