Great work there JJ ... I have been doing a bit of short exposure stacks and think it offers graet opportunity for many cameras and places less demands on mount and tracking (somewhat) ...
As to what to do.. just keep doing what you are doing.. try more subs (until the computer says no more) , higher iso (its a trade off but I like more light even if its grainy) and a dark frame subtract... dont come in until the battery is flat or the card is full.. when card emptied and battery recharged go out again and take more...
You should frame your photo I reckon as it is a shot to be proud of.
alex
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