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Sorry I don't know the answer to your question, but I'm gonna throw in a 3rd option which to me is easier to understand/visualise and therefore, fix.
I haven't used ASTAP but did buy CCDi which to me was a little tedious use. If you use N.I.N.A., its aberration inspector, to me, is easier to understand, and therefore easier to fix (if you do have any tilt or BF issues).
I've attached the screenshots here. They're pretty much self-explanatory. You could try NINA and see how it compares with ASTAP/CCDi.
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