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Nice image Leon. I also agree with longer subs and more ISO. The signal increase is so much great doing this that it more than compensates for anything else. You can do your darks later if you like. I have found that I can use darks from longer sub sets but just need to use a bias set to compensate in the subtractions. Meaning that you can use darks that are several minutes longer and still apply them to a shorter exposure image.
Many of the top DSLR guys also suggest that you can also use a wide ranging dark set where the temperature ranges drastically. You don't really need to do the darks at the same time. I have found that this is also true. You can then make a master dark that covers a wide temperature range and with differing durations.
You might like to try perhaps increasing the contrast a little, just to reduce the flat look the image has. Just my opinion of course and I leave that up to you.
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