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Dan,
The data doesn't look stretched or it has been but not far enough. Maybe you've done this on purpose to mask the gradient - not sure. You've got good information in the dim areas. More data wouldn't go astray.
Indeed, you need to take some flats (sky or lightbox) as there is uneven illumination of the frame. Once this is sorted, I'd concentrate on your colour balance. Look forward to seeing more.
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