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Scott Fandangoyou said "Mathematical probability suggests that in a fairly large sampling of 300 cards, if 14 of them were undergraded, then it is likely that 14 others were overgraded. Nothing personal, but I don't like this"
one thing i think you are overlooking....
when PSA bumps a card, they are not admitting they were wrong, they are saying ths card now belongs in the new category ( a category to distinguish excellent examples within a specific grade.... if they bumped from a 8 to a 9,they would be saying they made a mistake, but a bump from 8 to 8.5, there is no admission of wrond grading the first time around...