I have only one tactic in this kind of weather : stay under where it doesn't shake the crew, surface only for reloading, take out the card decks, craps, chess, backgammon, etc.. and wait for better times.
From my experience at sea, I think the most unreal thing in SH3 is having heavy fog with 30 knots winds. When you have heavy fog at sea, you usually have no wind or very little at the same time.