The reason the lead angle is larger with a slow torpedo is that you're trying to get the torp to impact at as close to a 90° angle as you can manage, for maximum chance of detonation. If you fire when the ship is at 0° to yours, the torpedo will wind up coming from the rear of the ship to some degree, so you fire before the ship reaches the 0° position to allow for this. It takes longer for the slow torpedo to reach the target than the fast one, thus the target ship will go farther in this interval of time, therefore you fire a little sooner.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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