Just a suggestion. Using the .sim files present in original Magnum Opus (not in the latest fix), I changed the submerged displacement to 770. In my game, it works great, the uboat levels at precisely the ordered depth, from PD down to 100 meters. I never had the chance to test it below this depth, as I am still stalking ships on the Eastern Approaches, but maybe you'll take it as a starting point.
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