If you are talking about the zig-zag defense that the ship follows after it has detected you, then it is not a zig-zag really, instead it's more like a sine wave.
If you are trying to shoot from a distance, then the answer is really that you should indeed use an effective speed measurement, and i'd say knock off 1-2 knots is about right. You should also use a spread.
But if you are close, then this is not necessary. The target is still actually moving at the previously determined speed. If you time the attack so that the entire torpedo run will occur while the target AOB is between 70 and 90 then you can just use the original speed solution.
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill
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