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FWIW is there any possibility that you could have vibration induced by the cooling fan(s) in the camera? The fan(s) should have low vibration, but if it just happens to be at the right frequency to induce a resonance, you could get this sort of image. Saw similar when I tried to fit a Barlow between my scope and QHY8 - worked fine with no Barlow, or with an MPCC, but the Barlow produced just the right combination of mass and flexure and the little stellar points turned into little lines (not triangles). In my case, just carefully placing my hand on the camera was sufficient to damp the resonance - not a solution, but a useful diagnostic.
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