Thanks everyone
Heres tonights effort, along with a screenshot of Live View zoom window showing a full resolution area in real time. It makes positioning and focusing so easy (full frame for positioning then the full res. zoom to focus.
Full res.
view here
5x ISO100 250th sec shots stacked
It allows me to gauge the seeing too, it was boiling somewhat, with moments of blurryness and a few clearer moments
Scott