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I’m about to put down some 9 inch wide pine flooring. My subfloor, which is 3/4 inch plywood, is a little warped, and in some places there is a little flex. I’m thinking about putting down a layer of 1/2 plywood over the existing subfloor, grain in the opposite direction, before putting the flooring down. I’d glue and screw it into the joists.
I could use a flooring edger to knock down some of the existing plywood, but I like the idea of reenforcing, both for the flex, and for sound.
Any recommendations on what I might use to glue down? Does it make sense to use some sort of mastic instead in order to even out the floor?

BTW, I got the flooring from a guy in Michigan who delivered it himself. I haven’t put the floor down yet or finished it, but so far it looks like it’s going to be great. If anyone is interested, I’ll post his url, or email it to you.