The haloing is from the focus not quiet there, I had the same problem when I got my L-extreme and didn't work it out till processing.
As I can see in your sig you use a foucuscube2 as I do, since I've gotten it all haloing issues have gone.
I'm not sure on what capturing program you use but for the moment I'm using NINA with great results, my auto focus numbers for it are as follows, hope this helps.
Karl
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