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Looks good for a first attempt, Jeff. How did you do the Ha blend?
Here's a PixelMath expression that I often find helpful: "Ha - (R-med(R)) * F". Ha is the Ha master, R is a red master (linear data, i.e. not stretched) and F is a fudge factor multiplier. You can calculate F from the bandwidth of the Ha and R filters but it usually needs a bit of tweaking so I find it easier to just start around 0.1 and adjust up and down until I like the result.
What this does is remove bright broadband sources, like stars, and leaves the Ha features. A simple way to use the result is to denoise and stretch it, apply as a mask to your RGB image and then boost the red and perhaps the blue a little as well (emission from ionised Hydrogen includes blue H beta as well as deep red H alpha.)
Cheers,
Rick.
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