i would put it on a 2x4 caul to straighten it out and maybe put a little more reflex there.
i have tried some test pieces of silver maple as we have 3 huge ones in the yard , and toasting the belly helped immensly with set. the wood may have been too wet or not seasoned , but it held up fine as long as you dont pull it too far. splinters came up on the edges a lot for me , but i was just using some straight 1/2" sticks about 3' long , just a crude test of the wood since we have so much of it.
and yeah , follow the grain or back it.
-hov