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Nice work David.
Adding Ha to the red channel though is old school and a very unforgiving approach.
A way more flexible approach is the Don Goldman Astrodon screen layer method. It allows you to play with different levels of narrowband data and you have ultimate flexibility. Adding to the red channel is a one way street with no later changes possible.
There is a tutorial on how to do it on the astrodon website. I often use other blending methods rather than Screen to do the blending though. Screen often is too strong.
You can also add ha as luminance as a layer on top and sometimes get away with it. It usually wrecks the colour and damages the stars sometimes but turn the layer opacity down to the point where its adding detail but not smashing the colours and stars and you can get an improvement. I don't think it will be the same for 2 images in a row though.
Adding your blue back in would be easy in layers in Photoshop. Set it to lighten blending mode and adjust opacity to suit.
Greg.
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