I went thru this a couple years ago, I got this response from Jim VB:
"Your scanner uses CIS technology. This has some advantages in compactness, so many all-in-ones use it, but it's not the best with thick articles (like slabbed cards.). For that, you'd prefer CCD technology. Those focus on the card, not the slab itself."
Your scanner is focusing on the slab, not the card inside the slab. Use a CCD scanner and your problems will go away.
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