Do you mean the positive boyuancy lifted you BY 30 meters or TO 30 meters ? When I tested it I dove to 150 meters and the boat stoped lifting when at 127m if I remember correctly.
In case of being DC'ed this is not too bad. Every time depth charges are launched you should go at flank speed and turn and you can use that opportunity to dive deeper again. Then you drop back to 1 knot. Until the next time they frop DC's you won't be bounced up that much. If you are later forced to make a quick evasive turn you can alter your depth again.
Works well for me.
Hope this helps a little bit.
EDIT: Someone has been faster than me :>
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