Well I usually use Jungman's sonar mod located
here.
My major destroyer problem is when you came up against an elite crew. As Jungman says in the readme with this mod, it's nearly impossible to get away. The destroyer can out turn you and always keep you inside the 90 degree angle necessary for ASDIC in the stock game.
That mod creates a minimum distance and decreases the ASDIC angles. At least this way you have a sporting chance. The only problem I see is with the minimum distance. It sometimes causes DDs to act unrealistically stupid. The other day I had a DD coming straight for me and then stopped right before the DC run because he lost me. He then made a hard turn and went in the other direction. While this minimum distance makes things a little more realistic, the game engine wasn't exactly designed to work with it causing some strange behavior.
Perhaps if the minimum distance was decreased a little more to encourage the DDs to make their DC even though the target was lost right beforehand.