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The purpose of a flat is to remove unevenness of illumination in your images.
Unless you have a bright white centre in your light than this flat is obviously not going to work.
I wold first - clean your filters they are extremely dirty (better to have a clean filter than rely on flats to remove dust donuts) and reduce the exposure.
A microfiber cloth is good for cleaning filters.
80% of full well is very high I think 30% is often a bit high but roughly what I am for. Some scopes do have a hot spot in the middle of the optics like that. I think its more common now as mirrored scopes almost always have a lens corrector.
Greg.
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