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Making a good star mask can take some effort and tweaking of parameters.
One useful trick is to copy your image and hit it with a big HDRMultiscaleTransform (maybe 4, 5 or 6 layers and 4-6 iterations) and then build the star mask from that image.
Play with the scale, structure growth and smoothness. If you're working with a linear image then the midtones value is important (probably a good idea to stretch a copy and then HDRMT as described above).
Sometimes I build a star mask and then do fine tuning with MorphologicalTransformation to grow or erode the mask.
Unfortunately, every image is different and it's not possible to give recipes that work in all cases. You have to play around and experiment.
I'm happy to have a go at building a mask if you want to put a FITS file somewhere I can download it.
Cheers,
Rick.
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