Peter,
Quote:
Err...I did use an AOL for that data.
What hamstrung me for ages was getting a tele-extender in place to cover a big sensor without sag in the optical train. That problem is now solved 
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I am sorry.
I just read the detail on the photo again and saw "AOL".
Well - that's it then - you've gone as far as you can go.
Only higher altitude & better seeing could improve it.
(as you were saying too)