John, I read an actual account of RN escorts being able to make a run on a submerged U-boat, due to shifting heading...true, it was a flower corvette that was doing the chasing, and the boat was a type VIIC.
Also, I think the escorts are uber...I used the external camera, and always, they did runs right over my position....also, by checking with camera, I also see that they drop their cans at my depth.... even when I switch depth..how???.....
This is in Summer 1944. You don't have a chance....
The book is Convoy, by Middlebrook, I think.