This is an old thread, but I thought I'd chime in anyway. I'm using the stock game with the 1.4 patch. I generally sink C3's with one shot: Using the impact setting at 5.5 meters depth, I aim for the very front edge of the superstructure. Every time I've tried this, it cracks them like an egg.
I've had the same experience with T2 and T3 tankers by aiming just aft of the forward superstructure. One hit fireworks.
I have the most trouble with the C2s. A shot in the engine room usually does it, but not always.
I hope this helps -
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