Too deep torpedoes , any trick?

[fastfed]

Using NYGM and the hard coded patch.
It's 1941, and I swear almost every torpedo shoots out of my uboat and dives like a deep sea diver!
It must go down 20 meters and all just go under the target. I thought by setting them as shallow as can be would fix it, I thought maybe setting them to 4 meters would fix it.
normally its 2/4 torpedoes do this, just this last patrol in the middle of a fat convoy with a giant not 900m away, all 4 went right under! so annoying.

Do I just deal with this until later in the war? It seems both electric and steam eels act the same way