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Stuart you can see an example of a sub. It is a red sub, which has been stretched so you can see the shapes better.
I have been using CCD stack to stack the images.
Marc, the collimation is fine really and I appreciate your comments. I visually checked collimation with the QSI. It looked fine to me. CCD inspector says it has 7.1" of miscollimation in the final image but all the subs vary quite widely in what collimation it found. The field flattener must surely be at the wrong distance though and this could be exacerbating any minor collimation errors or worse creating some curvature over different parts of the field. Wouldn't this be the case?
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