That hint of Green really helps the depth of the image. I have found this works quite well…and although I dislike green in Astro images…it works to advantage on a wide field like this.
As for taking the stars out and then back in, I am not sure if this is causing the ‘blotchy’ effect when one looks closer. I am going to quote ‘RickS’ post on PI forum…this is a really good way to bring star colour into a NB image. As Rick says - not always just that easy…but worth playing with.
“I usually add RGB stars to a NB image by extracting the L, a* and b* channels from each then using PixelMath and a star mask to blend the a* and b* from the RGB with the a* and b* from the NB image. Recombine the L, a* and b* for the NB image and voila! Sounds easy but there’s always a bit of messing around and tuning for any specific image. The advantage of this approach is that the original NB star profiles are preserved and only the colour is changed.”