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Craig,
Great details, but rather heavy on the red weighting - probably due to Ha being the direct replacement for R. Not ideal given the strength of Ha data vs GB is vastly different.
I would suggest splitting the R channel out from the RGB data, but don't directly replace it with the Ha. With the R channel split, blend the Ha data into it (a separate layer all together). Try a 30% opacity in normal or lighten blend modes to start with. It it doesn't need a high opacity as all you're trying to do is colour a little of the Ha data. Deeper reds can be achieved by increasing the opacity, but be careful you don't over do it. Just re-use the original Ha data as the luminance. Once you've got a reasonable balance across the channels, you can start to boost the saturation of the [Ha+R]GB to match the intensity of the Ha luminance. Doing so, will ensure your other colour channels are equally saturated, not just the red. If desired you can perform the multiple luminance layering technique to create a superHaRGB to better match the resolution of the luminance with regards to colour. Trial and error, but you're making improvements. Keep at it.
Cheers
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