Torps run deep?

That's it?! Now i know why the torps are running true but ain't detonating. The blasted fishys keep on bouncing of the lower curve.
It's kinda irritating when the torp should strike home, you ain't getting a "Torpedo is a dud" but nothing happens. They are bouncing or simply passing below.
Well then, you little ships, this evening you're gonna sink!