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I have seens these diagonal streaks in some of my images too, they seem to be most common in stacked frames with poor signal to noise ratios. The cure is longer exposures/more exposures.
Darks do not get rid of these streaks, this is due to the dark subtraction routine not compensating for all hot pixels...(ie not those below a cut off value). These uncorrected pixels then appear to move in a stacked image as tracking is never perfect (non-existant in your case). I think compressed images will have worse impacts than RAW but the best answer is to improve signal to noise...
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