Take off hinges and latches and see if they fit at all before all this cranking/cutting/stretching/drilling/shimming. There are fairly large gaps and associated tolerances allowable from factory. But of course, they do have to actually close and look uniform. If you can mock them in there as you want them to fit, you may then see the best method to proceed. Grinding A LITTLE on door edges and/or opening edges is not out of the question either....or "filling" as the case may be. I would not jack on the opening under any circumstance.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn