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I've not used APT. Backyard EOS has a dithering function if you're using PHD - tells PHD to dither between exposures. I've not used it, but am going to after this discussion.
James, I've almost always had these striations before in darks, not lights. Shooting a long run of darks inside in the warm is not always a good idea!
The other time I get them is I I have been using live view to frame and focus. Live view pushes the temp though the roof! Now I always go to the object, fame and focus, THEN calibrate PhD, before imaging. Gives the sensor time to cool off a bit.
That said,I've just bought a drinks cooler from Jaycar which I am going to cannibalise into a camera cooling box.
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