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Nice image Clive.
Overall its very good, the only improvement would be as Marcus suggests.
I use the Astrodon technique for blending narrowband. There are several ways to do it. But Don Goldman's one is quite good. Its a tutorial on the astrodon site using the screen layer mode to blend narrowband images.
I don't use screen mode though as I don't seem to get the same results as Don does.
The salmon colour comes from using Ha as red as luminance. it won't give you that rich magentish pinky red HAlpha colour. You can blend in a bit of Ha in luminosity blend mode in Photoshop but in moderation and only after you set your Ha to red and 242 in a Photoshop layer (screen mode or try one of the others until you get the look you want).
For your setup it would be hard to beat an ASI 2600m or a QHY268M (same APSc sized sensor). They are extremely popular and the 3.76 micron pixel size would suit your WO 132 really well.
This and the full frame version are the first sensors to have no amp glow, do 16 bit. They also have outstanding QE at 90%+ and still very high QE in narrowband at 75% or so. They do however give a slight horizontal banding you have to be aware of and expose accordingly.
Greg.
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