What is the point of proofgrade materials?

My proofgrade doesn’t cut through cleanly at times. It can be really annoying. My problem is always my fault because I have not been storing the wood flat, so it gets bowed. Now that I keep it flat, I have been getting great results. I have ordered more proofgrade twice now.

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If the warp is slight, I find rare earth magnets hold it down to the crumb tray and flatten it out.

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