Hey Dave, must've missed this thread earlier. Great stuff.
I also played with Rogelio's PI star mask method, but couldn't quite get it tweaked for my images. What I've found works for me is a simple star mask, and using MorphTransform erosion at .3-.5 instead of 1.0. I think he uses one of the other algorithms, but I found erosion worked better. Don't try to do it all in one hit, else you do end up with those weird patterns and stars linking up. Do it once, then generate another star mask, then do again, little bits at a time.
For the Ha blending into LRGB, I've been tinkering with that
HaRGB combination script. It seems to work better on some images than others. I've been playing around with using linear images, non-linear/stretched, LRGB vs just RGB. I think the best results I've had are with LRGB stretched, Ha stretched, then use those 2 images in the script. Not sure if that makes sense. Can post more detail later if you like.