1- I too have noticed their tendency to steer away from you. I can only surmise that they're steering away from the datum point from whence you fired the torpedo. They will most certainly maneuver their boat to get the best cannon fire on you, which I always find odd (dueling with a U-Boat doesn't seem that healthy of an idea).
2- You can sink them on the surface if you bring your boat up in a spot they can't reach with their guns. That's usually directly in front and/or directly in back of their boat. They can't shoot through their own ship!
3- When ships start to zig, it's really hard to nail them. Especially smaller, fast-moving ships. Your best bet at hitting them (IMO) is to slightly anticipate their turn by overestimating the AoB towards the direction they're turning.
4- Finally, don't waste 4 torpedoes on these boats. I did that a couple of times before giving up. I would suggest that you instead back off, let them calm down (they do often stop their zig-zagging with time), then put another torpedo into them! If you can't do that, you're wasting your torps. Follow them and hope that they sink with time.
5- Really finally, bow shots tend to be the best at sinking ships. Rare other shots may have more destructive impacts, but hitting the bow is perhaps the best way to sink a ship. Try aiming for it if you can, and maybe you can avoid the need for a second torp altogether!
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