Hi Paul,
Nice picture, but it's a bit green?
Those halos around the stars are an artifact of the Ha luminance. I've tried blurring the colour layer, doesn't work. I think the best bet would be to remove the stars, then blend that back into the luminance. Then layer over the top some LRGB stars from shorter exposures (say 30secs). When I did the Eta Carina mosaic, the different scopes for Ha and colour stopped the halos from forming.
Cheers
Stuart
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