Here give this a try.
http://www.subsim.com/radioroom/showthread.php?t=164452
I should have a new version out soon with more little improvments. Plus if you really want to kick it up a notch use it with this mod. It makes the AI for the destroyers better plus has an added benefit of planes and destroyers working together. So if a plane spots you and a destroyers near then it may just come steaming over.
http://www.subsim.com/radioroom/showthread.php?t=165886