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Those spots are your Hot Pixels and the line of them actually is the same hot pixel moved to a different place on the image by the dithering making it easier to get rid of then with calibration. This is why dithering is done. You have to calibrate the images (bias, darks and flats) before you stack. It looks like the Lum image has been calibrated. I have the same camera and mount and my USB cables are bunched together with no problems. Sorry if I'm 'teaching granpa to suck eggs' as it were but that's what it seems like.
Charles
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