2: Unless you are going to do a port raid (wouldn't recommend using a duck for something like that) stay clear of the port itself, except for Gibraltor (which has a steep cliff just outside the subnet) all the ports are shallow water; something which you should generally avoid whenever possible.
Lying in wait 10-20 km outside the port is good as already suggested. Be careful though, you might run into a inbound convoy with its escorts still in tow. Unless you manage to sink the ship immediately you run the risk of not getting the chance for any credit. Normally when you're attacking a convoy and a ship's propulsions dies you just leave it be and come back for it later to finish off with the deck gun.
Since the port you are camping is the destination, once the ships arrive there the wounded ship will just disapear. Conversely if you hit a tanker right it the sweat spot and it blows up with just 1 eel you'll still get credit; even if 2 or 3 minutes later all the rest of the ships disapear.
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