Mark, clay loses water as it dries so it will shrink. The challenge is to control the shrink. Making the clay sheet thin helps with quicker drying. Using a porous material like wood as a substrate will pull water faster from the bottom causing the cupping. I formed my sheets on a modeling mat which worked pretty well. Covering the clay with a damp towel would help slow down the uneven drying. My trolley brick was formed in place on plywood. As long as the wood is damp, the clay will stick and.not be able to cup. You might be able to flatten your bricks by turning face down, covering with a damp towel and weighting it down for 12 to 24 hours. Not sure if the drying of this material is reversible, but worth a try.
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