-Attack at night.
-Don't use magnetic pistol in especially rough seas.
-Try to attack abeam of your target (90 degrees off the keel of the ship).
-When a ship is near dont gun your engines or else he'll hear you and zig zag.
-Open torpedo tube doors before firing (the delay of opening throws off the firing solution).
-Get the Merchant Vulnerability Mod so that you don't waste many torpedoes trying to sink one ship (tells you where the hot spots to shoot at are).
-Don't try to play chicken with a destroyer and your deck gun.
-Fire steam powered torpedoes at night and electric powered torpedoes during sunlight hours (Steam powered torp leaves a visible wake while elec doesnt).
-Dont use any speed above "ahead 1/3" unless engaging or running away from an enemy to conserve fuel.
-Always remember that your greatest weapon is stealth.
-Beware of escorts when attacking a convoy (obviously) and try to attack when they are farther away from your target.
-Its alright to use your deck gun on smaller targets (under 2000 tons) to save torps.
These are general guide lines I follow and those are all that I can think of right now. I'll leave it to better players to write up more complete strategies.
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