Did you save while under water? If so, there is a bug, originating in stock SH3 where saving underwater leads to corrupt game saves and other weirdness.
Blowing ballast COULD be detected. It's certainly less stealthy than adjusting the bow planes and adjusting depth by a few meters. A sudden discharge of air could be heard just as rolling along at 3 knots in a type VII or a IX can be heard. Also, the boat suddenly is rising rapidly through the water, and the hull-popping noise can be heard. In reading accounts from destroyer captains, their sonarman could detect hull-popping after a depth charge run, if the boat was critically damaged and the Germans were going to blow to the surface.
To stay stealthy, generally a good idea to do small turns.If you have to crank it and make a hard turn, do so after they make their run. That way you are in their baffles. When this happens,you are in the DDs acoustic shadow.
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