Keeping rgb Star colour when adding to narrowband image

[assouptro]

Hi folks 

I have been learning more and more about pixinsight and now I’m able to register, align and stack an image, with the added bonus of star colour correcting with SPCC 

When I have removed the rgb stars subsequently try to add them  to a narrowband starless image I loose the star colour on bright parts of the nebula 

I’ve used the screen stars pixelmath recommended in starxterminator and I’ve also tried image blend (fantastic newish script!) but I get the same results 

Would I be better screen blending in photoshop? or do I need to learn new pixelmath methods? 
 

Any help would be greatly appreciated, I want to retain the colour of the stars over the bright parts of the nebula rather than just have them white 

Thanks 

Bryan 

[assouptro]

After some more research, I’m going to give this a go

it looks promising! 😊