[TorpX]

... and a 70% chance of 10 foot depth variation which might be better eliminated since we're all aware of it and set the depth shallower anyway.

This, for me, is the problem with a Torpedo mod, any torpedo mod. If we substitute numbers that we consider appropriate/better/more pleasing, we know what the chances are, and this makes the whole deal rather artificial. The real skippers had to figure it all out by trial and error, wasting fish over the course of several patrols, while we know before we launch the first torp.

That said, a 99% chance of a dud, seems insanely high under any circumstances.