-DiD
-Always travel on lower TC in high air-threat areas; dive and submerge in these whenever possible
-Dive and travel mostly underwater during storms, use only 'slow ahead' during stormy weather
-Use Schnorchel on 'slow ahead' only
-"Move" between compartments by mouse clicks (in my 'prime' WaW careers, change stations by moving through the boat with the Shift+F2 camera only)
-Never fight aircraft "to kill", only when cornered
-Attack targets at night and on surface whenever possible (I do allow use of WO targeting for high-speed night attacks)
-Only manual targeting through periscopes (no WO help there)
-Reloading external torpedoes only in calm weather and with engines off
-Never hunt for escorts or patrolling warships
-And, perhaps the funkiest rule of all - I make many decisions and add unpredictable variation to my game by tossing coins to determine certain circumstances and courses of action (e.g., changing patrol area, taking a riskier or a safer course, delaying WO's target calculations etc.)
Great times
