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Hi Peter
That's actually a really good shot for 231 seconds. I think you have a really good unit, mine doesn't perform close to that well.
If you can consistently get a good % of keepers with what you are currently doing then maybe drop the exposure time to something like 120 or 180 seconds and up the iso to around 800 and stack as many as possible.
If you had the funds, I would suggest a guiding setup. It helped me go from under 60sec @380mm to getting 100% keepers at 300secs now. It does make the whole setup less grab-and-go but I wouldn't be without it these days.
As an extra, a guide setup would also allow you to use sharpcap (or similar) for your polar aligning, I can get PA done in a couple of minutes these days and its an order of magnitude more accurate than eyeballing it or drift aligning.
Regards
Chris
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