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I have removed the corrector from my C925 twice to clean it. Mine seems occasionally to get a bloom from what I think is the grease on the baffle tube outgassing. It feels a bit daunting to remove the corrector but it is really not that bad. Maybe helped by mine being around ten years old now so I am not as precious about it as I used to be.
My secondary has rotated a couple of times too. There is a roll pin in the holder that indexes it in the housing that attaches to the corrector. On mine that points to what was the "top" of the OTA when it was horizontal in the old CPC mount. You can tweak the tension of the holder in the corrector while you have it apart but it is likely to be like most things optical, "Just tight enough" will be the aim to avoid pinching any glass. I am not sure if rotation of the secondary makes any difference in actual fact to optical performance, there seems to have been a lot of conjecture over the years as to if Celestron match them any more or just bang them together and if they test OK, send them in to the world.
Aligning the screws so that the apex of the triangle it pointed to the "Top" of the OTA is handy though for collimating with a camera, if the camera is oriented the right way as well it makes it easy to pick which screws to move. That may not apply to an Edge HD as the normal SCT coma at the edges is the telltale to collimate with in focus and the Edge HD having less curvature and tighter stars off axis might not display it as visibly.
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