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Try Super soft II
or another verneer softener.
spray them then clamp flat with room for air to circulate around them.
Then let sit for a few days still clamped flat.

Mike

Bake between two flat metal plates in a 350º F. oven for a couple of hours. [not the spruce]

I flatten stuff on my table saw top, with my heat balnket, a piece of ply and some weights. I spritz the wood, wrap in foil, turn up the blanket like I am bending, the ply and weights on top. Wait five minutes and turn off, let cool .... works for me. rosewoods are easy to do this way ....

I'm having kind of the same problem with my zebrawood. it looks like a smilely face. I wiped the wood with a wet rag once the clamped it flat with some peaces under the edges to raise it up a little. it worked until I brought the wood back in to my house were its a warmer and it bowed right back up.

I use a single blanket set for about 340 - flat surface/side-by-side slats,blanket, single slat on top, another flat board, and about 60 lbs of weight. There's not much need for wetting rosewood - as Howard suggested, hit a temp around 350 and the wood develops a nice case of amnesia and flattened out. I've had to flatten several sets of coco or BRW, and never an issue with things getting flat and staying flat. Only caution is resist the temptation to pull the wood out of the stack before it's full cooled...even warm BRW seems to be willing to bend a bit....must be all that resin.