Flexing a Flex Plate?

It looks like lots of folks have this same B&M flex plate lying around loose. Can someone put a straightedge across the back of their flexplate and let me know if theirs is in fact perfectly flat?

As per my post #10 above, the "flat" section of my flex plate is a little bit concave from the engine side although I can't put a straightedge on the back with it bolted to the crank.

I didn't check for perfect flatness when I originally installed it, and am wondering if my flex plate is somehow to blame for this poor fit now??

Covering all the bases. Thanks.

Mine was perfectly flat.