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Mick, that's a much smoother result but in achieving that you may have killed some detail. It's very bluey-green, why use any filter? Are you in a light polluted area? If you want the colour to look natural, I'd just shoot it using AWB and make sure the RGB levels all peak in the same location on the histogram when processing in DSS.
I took one about 18 months ago with the exact same outfit you have but with a modded 550d . I was only managing 15 - 20 sec subs back then in a relatively dark sky site at 1600 ISO, probably 5 - 10 subs. No Dark's or Flats, unguided. The colour looked good.
My suggestion is to try again from a dark sky site and reduce your subs to 20 secs but take a lot more - like 20 to 30 maybe. That will help with noise reduction and the shorter subs will help with tracking errors, forget the filter at this stage. Well done in using your calibrated files with your lights. I'm only just starting to use them on my shots now. Good luck, you'll get there. It can be a very frustrating hobby!
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