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Have you reached as far as you can with the ranges to remove the noise? Or stopped because you were losing nebulosity? You can export your range mask as a tiff and edit it elsewhere (eg photoshop) if no choice by thats ugly too. Another approach could be take your source image and give it a 2 to 3 pixel gaussian blur to kill most of the noise, and use that to create your range mask from. Of course you use that rangemask on your original image for processing but the mask is never critical to be pixel perfect directly from the original. Likewise your star mask can be generated from a blurred original too, detail doesn't matter and the star mask can be tricky to get the stars right too. Getting the two masks to match together tends to be difficult, I prefer removing the stars completely leaving background/nebulosity to boost and adding the stars back later. Good luck with the book.
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