[Umfuld]

You can usually hear when the escort moves right overhead. And your hydro man will often warn you that DCs have been dropped.

At this moment it's not a bad idea to give it some speed.


And turn as well (maybe after a couple seconds to get moving first). Don't do it for very long. Just long enough to get away from the current cans dropping on you.
Then cut back to slow and keep turning for a bit while you still have some speed.


Turning while trying to stay silent and diving at the same time is tough. You are almost standing still if diving and turning at 100RPM (silent running).
So I do most of my turning during those few seconds I floor it after a drop right above me.



And yes, staying on the surface to get those extra kills is risky. I usually start diving just before I fire my first torpedo.