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Overall great image. Image suffers from the Ha tending towards salmon colour. It does that easily if you use Ha as luminosity.
Ha blends are best done in my opinion as lighten blend modes. That way things that are bright in the image remain (like nice rgb stars) and Ha does not come through that hard. Now you can control that layer with curves. You delete the green and blue channel to get a red Ha layer.
Now before you delete the Ha layer green and blue channel make a duplicate layer for Ha as blue and delete red and green (click on green, hold shift click on red, then control A (to select) then hit delete to get rid of it now click on the rgb channel and it is now all blue or all red).
Generally 10 -20% opacity for blue channel and red to taste maybe 50% perhaps a little curves if you want it to come through more.
My taste? I knock Ha back so it doesn't overwhelm the image. In my early processing days my Ha LRGB images were super red, not anymore. In my view you want a balance of colours. An all red Ha type neb image is not pleasing at all. So kick it down, smack it down and use S shaped curves or whatever to have the Ha come through where it accentuates and adds and not show its ugly head otherwise. That is where the art and judgement is. You want it to add some nice depth, some nice detail but not be the image. Consider it like a flavour enhancer. Its not the meal just peps the taste.
Greg.
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