Looks like you are on to something based on the two scans. The printed back on the SGC graded example appears slightly thinner than your example, but perhaps it is simply the difference in scan size that deceives me. Can you crop the SGC example back so that they are approximately the same size to see if there is a difference.
Also, is it common for the front to be perfectly centered but the back to have that "diamond cut" look?
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HOF "Earliest" Collection (Ideal - Indiv): 244/342 (71.4%)
1914 T330-2 Piedmont Art Stamps......: 114/119 (95.8%)
1923 V100 Willard's Chocolate............: 177/180 (98.3%)
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