There's no real node or property or controller that allows you to alter that, although I do think it may be possible to trick the game in having the torp hit a ship more forward. But you must not search it with the torpedo, but with the ships themselfs. Either it zooms in on the rear of a ship in general (in which case you probably can't do much about it), or it zooms in on some nodes placed on the back of the ship (engine, props, etc.). Play around with it and see if you can find it
