So here's what I've done... or begun rather. Since part of my galley cabinet is already in due to also being the back wall, I'm attempting to treat it by building a jig to hold it correctly and using water/steam to soften the wood.
Built a square frame out of 2x4s and screwed it to the offending areas. And I'm treating it with a high-pressure steamer over the course of what will probably be several weeks. I still need to do a little tweaking on the right size, but the adjustment is perfect on the left side.

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