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Paul, Nice image. Resolved the Nebulosity quite well.
I would be surprised if it is flexure in the guide platform. It is not like it is moving huge amounts when guiding and the scopes concerned aren't that heavy. I would be more inclined to thing it's a PEC correction problem. I don't know whether you can turn PEC off but it may be worth a go if you can. The Tak mount shouldn't need it to maintain accuracy with active guiding.
Just a thought.
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