I don't think it's evr 'flat', though some are better than others probably. If I were you I'd fly cut both sides before you machined it anyway. Or at the least the side that's going to be the base to provide a good bottom to machine the top from (so it does'nt 'see~saw')...
There's no reason it'll 'distort' again. The shape is from the manufacturing process, not anything that happened after...
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