One thing I would suggest (I use the same camera with an ED72) is that they seem to benefit massively from a UV-IR cut filter. You will very likely get smaller stars, better colours and fewer reflection problems to chase. Unfortunately I can't show you a before and after on the Lagoon and triffid image I did recently. The filter made so much of a difference to mine that I dumped all the pre filter data!
What settings are you using with the camera? I have been finding 5 minutes at 120 gain pretty good, though with the new filter i need to spend a night to see what it will stand up to again.
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