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F9 is a pretty slow scope and although 720mm probably isn't deemed a long focal length you probably are getting to a point where the quality of your tracking comes in to play.
Stacking - I'd definitely be looking at doing multiple images and stacking in something like DeepSkyStacker - you'll be amazed at the difference compared to a single image.
Oh....one last thing....dont image when it's cloudy! hahahahaha
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