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This is quite a puzzling problem. No doubt when you find the culprit it will be relieving.
Did you try taking a shot with no filter or the filter wheel removed?
With an image showing elongation have you tried taking focus shots and holding the secondary slightly and pushing it one way or the other to see if you can correct the elongation, same with the focuser? It would take 2 people. One looking at the focus images and the other applying slight force to the focuser to try to make it correct back to round or to the secondary to see if it will correct back to round stars and you would have a quick idea where it is coming from or could eliminate an item.
Greg.
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