As I was carving away on the back plate arching, I noticed the flat side (non carved side) was starting to curl up, in a potato chip like manner. Is this from large amounts of stock being removed from only one side? Should I remove some stock from the inside now to balance things out? Would it be better to carve the back 6-10 ml heavy, let it sit for a few weeks, then finish the carving after the wood has relaxed to its new shape? Another explanation for the wood movment; maybe the wood is too new for instrument building.