There's no rational explanation I can even guess at, AFAIK a mark 14 is a mark 14 regardless if it's fired from a Porpoise or a Balao. I never heard of any data in the sub model for some kind of weird torpedo damage multiplier based on sub class.
Just finished attacking a task force similar to several I've encountered in the Sargo, only this time with the Porpoise. Two Hiryu and one Shokaku in column, two Takio escort carriers and a cruiser in the second column.
With the Sargo it's fairly easy to get between the columns and sink all five carriers, got 8 fish loaded and the escort carriers need only one fish each to go down, the three fleet carriers can be sunk with one but it sometimes takes two. One fish will stop it dead in the water or reduce it to 2 knots if it doesn't sink it, heavy damage even with Webster's 125% mod.
This blasted Porpoise takes TWO to sink each of those dinky escort carriers, and 3 or 4 to sink each fleet carrier, even with Webster's 150% mod.
If the game was geared more realistically so you got SOME credit for damaging ships without sinking them I wouldn't mind, but since you get zero points for turning a dozen battleships into floating junkyards I think I'm just gonna give up on the P class.
