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The outcast recipe sounds good and fairly close to what I also have done twice.
It helps to have the OTA mounted so that it can be pointed downward when blowing the dust out of the mirror with a rocket blower just as you would with a camera, and pointed upward when replacing the corrector.
My c8 scope is older so the secondary is fixed and I have read that the secondary misalignment can be fixed in collimation .
I have also read that misalignment of the corrector itself leads to problems. I would imagine an Edge HD is tested as shown in this image of the Celestron final mirror polish and alignment set up from an older journal I came across. Not sure what model these are being figured by hand or if this represents standard practice.
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