Thanks! I did notice the red channel alignment problem in post processing. It was only 3 or 4 frames of a 19 image red stack that went askew, Ill be more careful to manually nudge them in line for the next image. My bigger problem was contrast and color balance, as we have a fair amount of light pollution where the images were taken. I also tagged the image wrong, its just RGB, I didnt use the luminance frames for this stack.