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That tool set is amazing Ivo. But I need to get some of the PI processes under control, particularly pixel clipping.
I found the problem. Basic really. The final combination of the exposure subsets required a different clipping algorithm. Having done that the quality of the image and any underlying problems is immediately evident in the L* channel. Unless I push it really hard, the streakyness and milky appearance is all but gone. Differential flexure is a large part of the problem, but I've managed to minimize that by integrating the images in the way that I have.
The lesson is dithering - reframing the subject periodically throughout an imaging run. This is true for unguided work, particularly with accurate polar alignment - a fluke.
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