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Others will hopefully add their knowledge of taking astro photos with that mount but in the meantime I would start by changing the camera ISO to 800 or 1600 and taking shorter subs of 30 or 60 seconds and taking lots of them and then stacking them with software like Deep Sky Stacker.
The focal length you were using may be a bit much for the mount but shorter exposure times will help and having good polar alignment cannot be overestimated. Hope this advice will be of some help.
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