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Some suggestions
Hello Max
What i am seeing (within the limitations of a 200kb image) is a lot of coma, possible pixel alignment issues and certainly a considerable amount of blooming due to the sensitivity of the ccd at the red end of the spectrum.
I am also thinking there may be mechanical sagging or some alignments errors in the optical train of your setup. What i find intriguing is that the problem is confined to the lower 1/4 of the image only. Bright stars above dont seem to be affected. Its also interesting how the halo is oriented toward the left corner of the image on the left side and the right corner on the right and almost symmetrically near the middle.
Maybe during post processing, you can try to make adjustments to the red channel and curves to try to reduce the effect.
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