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Now by way of example to press the point. I have included crops of top and bottom left, top and bottom right and centre of your helix image. I cannot see any place where your stars are round. Certainly approaching round in the centre, but not far out from the centre bad deformation starts.
This deformation has to be coming from flex either in the back of the scope or the guide scope or a combination of both. I would say to a lesser extent from the guide scope as there is still some deformation in the centre and then the rest is from either the image circle itself and the weight of the camera assembly.
Is the scope itself supported by rings? What about the dove tail on the main scope? Is that a D sized dovetail? No point in holding the camera in place if the scope can flex from the camera.
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