One thing to keep in mind is that for stretches of the war- such as after the Norway campaign until Dec 1942- uboats were ordered not to use magnetic fuses on the torpedoes at all because they were faulty, and torpedoes in that time used impact. So during this time, the only error affecting torpedoes was a known depth problem that showed up in approximately half the torpedoes due to an air pressure problem in the depth-keeping mechanism. If a uboat tries a magnetic shot until Dec 1942, it should have a very high chance of failure, but after May 1940 the impact fuses should reliably work with a bit of depth variance.
So while it might not be possible or wise to simulate all the failures, I don't think a blanket % would be a good idea either.
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