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Very nice image Baz.
Are you imaging from a dark site or from suburban Canberra?
As you point out there is some tilt as the top right shows more coma than the other corners. None of it is eye catching though. A coma corrector would help. I found 3 tightening screws were really needed
for accurate squareness or preferrably (what I normally use with one or two exceptions) screw on adapters to minimise flexure and obtains almost perfect squareness. You also get the exact spacings for your flattener (they have a tolerance that is stated in +/- mm for accurate performance).
Greg.
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