I only play in subs and i never use circle search. Thats what the wires are for. I try to always have a UUV in the water befor i launch in case i have to run so i can still collect target data. And make course changes as needed. Also i try to launch from the other side of the layer of the target and try to activate 1 - 2000 yards from the target. Also i dont belive any angle of attack from an air platform gives a greater chance for a kill. The most important factor has to be distance. The closer the drop the better the chances. Then the odds of chance come into play. If the torp turns away from the sub and the sub turns away from the torp the odds for a hit just went againts the air platform.

Or you can get what I once saw (demo mission): detect the Victor on sonar, get a position with MAD, and drop a torpedo. And it circles. And circles. No hit. Turn on Show Truth, to see what's going on. The sub was in the middle of the circle search pattern. The torpedo hit it after the sub moved out of the search pattern.

That would seem to indicate that the circle search is too large of a circle.