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I found also I got some dark rings around stars. I think you'll find that comes from the Ha. I take it this image has Ha? Do a star mask on your Ha layer and the dark rings will probably go away or reduce. Anyway that worked for me.
With narrowband you have to protect the stars from narrowband data which is a star wrecker. Mask the stars on each narrowband filter added to LRGB data to preserve the LRGB stars. Make sure the star selection size is a tad larger than the stars themselves to prevent the rings.
The erosion filter is like the minimum filter and I think its quite a destructive filter and to be used lightly and preferably not on stars at all.
PixInsight has a median selection in the Morphological transformation tool.
If you set it to circles as the structure it can improve things but it can also wreck the rest of the image. So again I suppose a mask for the stars is needed (which is not a simple task in PI and simple to do in Photoshop).
Greg.
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