John I believe PSA does not penalize for diamond cuts or uneven cuts unless they exceed the defined centering guidelines for each grade. That being said I have submitted raw cards that came back "miscut" and on repeat submission were graded, some OC, some not any qualifier. There definitely is a component of subjectivity to the grading process.
This problem plagues many sets, including the ones I collect such as the 53 Bowmans, which has many cards with uneven cuts. Finding a nicely centered card is a challenge and usually sell at a premium, hence the saying "buy the card, not the holder".
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