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HankronAnother quick and simple physical thing to look at is to compare the opacity of your card to other T206s. Opacity is the 'see through effect' or 'how much light shines through' when an item is put up to a bright light, like a lamp or sunglight. Some cardstock will let no light through, some lots and most in between. If your card is significantly darker to the light than other T206s, that is a significant factor.
I do point out that this test may not be difinitive in your case. If your card is a case of a thin sheet of paper being affixed to the front, the opacity may not be changed much.