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I get a hard edge around saturated cores, which might be what you're talking about, when I don't protect them during decon.
When applying decon I create a luminance mask like you do, although I make the background near black, and try to push the midtones a lot so that I get good decon on my target and less "noise enhancement".
After creating that mask, I then create a star mask (from the original) to capture any of those stars with saturated cores (I usually go with a scale of 5 for this). I then subtract that star mask from the luminance mask I created initially, and then use the resulting mask to protect the image when performing the decon.
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