Blurry Photos

I have been shooting the Duxford air show over the last few days. I shot with a 70-200 f4, also added a Kenko 1.4 to this lens and shot with a friends 100-400. When shooting a pass of a plane, I will have blurry photos and a few shots in the series will be spot on but only about 25% of them. I shot in aperture mode with iso 200. I tied a small aperture that still gave around 500 shutter speed to try to get more depth in case the lens was focusing off the planes and wide open to try and get high shutter in case it was movement.

Neither seemed to help out the out of focus or blur in the photos. It also showed up on shots of folks walking around.

Looking for setting to help this out or technic that would help. I notice this when zoomed in at 2:1 on light room.

Here is some samples. The bottom one is one that is out of focus.

You can tell more from the full sized file, but are you sure? It looks more in focus to me.

How are your static shots at 1/500sec? I'm wondering if your panning technique could be part of the problem. Post #5:
First shoot with moving cars need advice.

Your right the bottom one is the sharp one. The static shots are fine but im not zoomed in al the way. The shots of folks walking wasn't sharp either and some of them was standing still. I would have thought the 100-400 would be krisper then they where.

Just not sure why only a few are sharp out of a pass. And what I can do it get them sharper. Even the slow planes where on and off.

Is looking at them at 2:1 asking to much.
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