I need a sanity check.
I am building kitchen cabinets using 3/4″ Birch ply with Cherry doors and face frames. Of 13 cabinets, 5 went well. Numbers 6 and 7 are driving me up the wall. At glue up, neither cabinet wanted to square-up, so I had to use a diagonal bar clamp to bring the diagonals into square. So far so good. Unfortunately, when I removed the clamps, I discovered the cabinets reverted to their out of square state (about 3/16″). I thought I could solve the problem by installing perfectly square inserts at the back. That worked and the backs are now square but the fronts will not square-up.
Short of starting over, is there any way to salvage the cabinets?