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Martin I'm a bit confused about how you are focusing , when you say that you pre focus 1/3 of the way it sounds like you are using hyperfocal settings to maximize the depth of field but this will only work in conjunction with other precise settings of aperture and the focal length of your lens .
I would recommend using MF and pre focus right on the line that the bike will be on and if you have a tripod use that and aim at the center of the scene , you will need a high shutter speed to freeze the action so a wide aperture will help and if needed a high ISO then fire off on continuous shooting .
The tripod will keep the foreground and background in the same place in all your shots so when you come to PP it will make your life a lot easier , the fast shutter speed is needed because the bike will be travelling across the scene quite fast and your not panning with it and you need to focus on the plane the bike will be on because you want the bike in focus as well as motion blur free .
Hope this helps a bit .
Mark
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