Cool Doug...playing around with old data what a cool idea, must try that sometime
..The last one does look pretty good. I can't help but compare the images of today to those of yester year, to have produced such an image with film would have been a religious experience.
Jase has provided a nice rework option, you should have a crack
you might try blurring the RGB data when blending it in to make the master RGB before adding the Ha this can help clean up the image a little.
Mike