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I have 450D and 1200D and never had banding but then I am on a guided mount so longer exposures and less processing push and amplification ( ISO6400) to contend with.
I suspect your high ISO is part of the problem. Normal recommendation is about 800-1600 max. You may have to do more exposures to collect more photons but the result should be more accurate and cleaner.
Also what was the ambient temperature while you were shooting ? The hotter it is the more noise and other issues occur.
How bad is Light Pollution from your imaging site ?
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