About the choice of targets, one piece of advice from the U-Boat Commanders Handbook:
It is better to destroy little than to damage much.
That's why I think it is better to pump 2 eels into each target, than to only use one. It does happen that a ship blows up after the first hit and thus that the second torp is a waste, but I think it is a calculated waste. If there are (big) tankers in the convoy, I always target them first, if not i go for the biggest vessels (they give you the most tonnage, and the goal of a Kaleun is to sink as much tonnage as possible)
There is also a rather crude method I use to make sure that torpedoes hit at approximately the same time; because the speed of a torp is about 30 knots I make this simple calculation: distance / 30.
For instance , 2 targets one 1800 and the other 1500....the calculation gives a rough travelling time of about 60 and 50. So you fire the torps at the 1800 target and at the other one 10 seconds later. They should explode not long after another, in any case before a zigzag becomes effective.
Happy hunting!
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Daddy cool 
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