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I am no authority on astrophotography but I looked closely at your photo and the triangles are regular 45 degree Rt angle triangles. This suggests movement in both axes that is beyond the guiding control. The guider is trying to correct for a large tracking error because the polar alignment is a fair way off. I think PEC may be the major cause.
If you can get your polar alignment closer it will reduce the need for correction in both planes and if this gives an improvement I think that will be the proof.
It does not look like any sort of problem with the optics
Barry
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