Welcome to extruded foam sheets. The pink Foamular (not Dow) foam you
were using can have quite a bit of stress in the skins. You have two
options. One is to shave a thin layer off the each side, the other is
to score the top and bottom of the sheet before you cut it. Using a
plank in addition to the weights to keep the foam blank flat helps too.
You will still end up with core beds that look like hobie hawk wings,
but your core should be fairly flat.
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