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Nice job, Lee!
A step you might find helpful for creating a synthetic luminance with PixelMath is to use LinearFit to match the Ha, Oiii and Sii before combining them. Otherwise they may be scaled quite differently. You can make up for this by tweaking the coefficients for the addition but I like to start with an even playing field.
Another option for creating a luminance for NB is to use ImageIntegration to do a noise-weighted combination of the Ha, Oiii and Sii (no rejection.) If the Ha is much better quality than the Oiii and Sii you may find they are under-represented (check the weights listed in the process console) but it can work well sometimes.
Cheers,
Rick.
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