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I'd need to see a higher resolution image, but it looks a wee bit overexposed and slightly out of focus which would be adding to your woes a bit.
We use the 200 EF at work, and it is prone to flaring, we can't use it for shots with a bright window in scene for example, so I think it probably is not a great lens to use for astro work.
Try a better polar alignment and doing more subs of shorter exposure times to bring down the flare, or stop the lens down a bit, were you shooting wide open?
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