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Hi Andrew and Darren, thanks for your comments. Yes Andrew the imaging train was identical, just changed the camera at the end from the 20Da to the Astro 40D.
I can see a hint of amp glow in your dark frame Andrew at the bottom right corner, and that is where mine shows up too. Depending on how much you have stretched/brightened the image, but yours looks very minimal compared to what I would get. Mine would show up a lot after 7 minutes, so your is very good for 16 minutes.
My mentor, Paul H. has suggested it could be a focus issue. I have not used a baltinov mask, still using the old hartman mask for focus.
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