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I would suggest a bit more exposure to be honest.
Do you use the in camera dark subtraction at all? Not sure what Canon call it, but is is "noise control" or similar.
More exposure, more exposure.
What are you using to capture? A software package you might like to try at some stage is Images Plus, it has Camera Control, as well as Processing. For DSLR files I find it great, chugs through them with ease. Nebulosity is another good one too.
Maxim is possibly THE best, but at this early stage it really isn't needed.
Gary
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