Make sure the back makes good contact at the upper bout linings and neck block. Of course you want to size the blocks. Then glue the back on starting at the tailblock, and working your way up. (You'll need to keep it temporarily clamped at the button area to maintain alignment.) This method will spread the "spring", just like the original maker did. Hopefully, you have already flattened any obvious high spots, and made sure the glue surfaces are true. The small amount of spring in the back will actually tend to counteract the string tension, so don't be concerned.
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