It's unclear to me that the cards were penalized because they were submitted in PSA holders. I don't know what effect, if any, that has on the graders. What troubles me most about this, and about grading in general, is that after you complained about the grades, SGC asked you to send half of them back for a review. Why do they have to go through this procedure all over again? Why not get them all right the first time? If grading really is so subjective then what's the point?
Crossing over cards for a regrade is like walking through a minefield. I'm sorry this happened to you, but my opinion is when you buy a card in say a PSA 5 holder, that is what it is at that point in time. Once you send it for a regrade or a crossover, all bets are off.
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