something very similar works for me too, although not when really close to one escort or another.then I generally drift downwards along the track of the last fish, with 5 to 10 degrees rudder away from the closest escort
If you have some room to play with, you might consider only going to about 4knts or so, makes less noise, oh, and decoys
also, why is it that escorts don't really respond to premature torpedoes, I had one blow up on me in rough weather the other day, went off maybe 50 meters from my boat
but no-one seemed to care....