I have to say I would listen to ky70 for anything to do with cards, and I also have 2 kem decks with problems, one pre and one post uspc. The former is becoming more and more seriously warped (I have KEM decks from the 50s and 60s that are less warped) and the latter has a large piece of the 5

that just snapped off playing a non poker game where the cards aren't even subject to any of the bending etc that poker would involve.