@tater: I think you did not get this, buddy. I repeat once again: the basic fact is that German late-war torps had heavier warheads than American. So I can state Japs just built crappy carriers and that is why less powerful US torps sank them equally easy as German ones. I suppose my explanation is more real than your divagations.
@Robbins: Great you have patience to wait several hours until ship sinks. Yet SH4 game designers had opposite intentions and introduced "quick sinking" model. I think majority of players also prefer developers point of view. Even it is too simplistic and ships sink too fast but that way SH4 game works. Yet what is much more important SH4 game engine may be inadequate for "flooding sinking" models and that is why many players report all this idiotic "unsinkable ships" issues in RFBeta. Think about it...