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I'll have to give PTGUI a looksy, I think I may have an older version (6 years at least) laying around somewhere.
A part of the issue I'm having is that there is some nasty noise left over by the camera. At ISO1600 the camera has 3.9e- read noise which under dark skies at F/5 means I need 120s to get above the read noise.
When I FIRST started in AP with my 10" LX200 I was doing 6s exposures and for a long time I thought I was actually dealing with electrical interference either from the power lines out the front of the house or even the WiFi signal. A large sine wave passing through the image. This is still noticeable at 30s at F/5 but at 60s it is just a discoloured banding. At 120s it is swamped by sky glow so it isn't noticeable.
The attached picture is the lower left corner (my first frame for the night). Areas where there is a lot going on it isn't noticeable, darker areas however have this banding which at 60s is a good proportion of the frames. Most of the stitching is pretty good, there are a handful of BAD spots but the bigger problem seems to be the noise in the frames themselves :/ Have tried the BackgroundExtraction in PI and it helps on frames like the one below but will likely cause more issues on the higher signal areas.
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