Or you could try to "de-uber" the destroyers by messing with sensors and AI values, since they're completely unrealistic in early war in GWX. The devs there seem to have this idea that harder=more realistic+more fun. In many cases this is true, but not here.
In fact, I recall someone questioning a former U-boot commander on the internet - I think it was Erich Topp? - about the relative difficulty of computer simulations vs real life and his quote was something like "In real life it was much easier." Perhaps someone could find the exact quote. I believe it was to do with AOTD.
When I was doing IuB I set the sensors to realistic values, which due to AI limitations made the DD's too easy to evade, but as I don't have SH3 anymore I would advise others to change the values themselves.
So, there are instructions around here:
http://www.subsim.com/radioroom/showthread.php?t=103589
And background info on sensors here:
http://www.subsim.com/radioroom/showthread.php?t=103968
Ciao.