I have never tried a shot at the stern like that, but when i'm approaching from a side angle i fire tubes 1 & 2 quickly, tube 1 is aimed at the ship and tube 2 is aimed ahead of the ship. Fish 1 usually misses when the DD goes to flank ahead, but the second one hits most of the time and either sinks the DD or does enough damage to stop the dragster effect.
__________________
|