Every attack is different in the way it plays out. And when your careful plans blow up on you, it happens suddenly. That's half of the fun of this game!
Just keep in mind that there's nothing special about my rules of thumb on lead angle. If you use 10 degrees when you should have used 20, you just hit the target 10 degrees later along its track. If you're early in the war, you might want to do that on purpose to avoid a perfect right angle impact, which often results in a dud.
If you actually are having trouble picking the lead angle, just check the Dick O'Kane method with a vector analysis of the same attack. That will tell you the perfect lead angle for a 90º torpedo track angle.
The guide I gave Munchausen works just as well as anything else you can use. The Dick O'Kane technique is so darned forgiving that you can get away with murder and still hit targets.
That's why it works so well for map updates off. 10 degrees difference from a perfect 90º to the track doesn't faze it a bit! The only truly critical parameter is target speed.
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