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What I notice on the image is that the alignment of stars (colour channels) is pretty good in the center, but progressively gets worse towards the edges. It's almost as if each channel has a different degree of curvature. But looking further I now notice that the red channel is always at the 4 o:clock position, just more so on the right side than the left side. Might your red filter be tilted somehow? And the upper left corner looks quite suspect. My guess is that something in your system is not aligned optically given the eneven degree of distortion. I hazzard a guess that if the distortions were symetrical your alignment optically would be good and the distortions could be a spacing issue of a flattener or reducer, etc. What is your gear and are you confident about these issues. How does this photo compare to previous attempts? Did something change?
Peter
PS I don't think this is a software issue at the root. Not saying software won't possibly help a bit however I highly doubt any software can fix what is on display. I think you must sort out the optical issue as a first priority.
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