Well if your hungry for a kill and the conditions stink, I have used a tactic I found usefull when I misjudge tracking and wind up behind the target searching with hydrophone.
Get in behind the merchant, I mean directly behind him "0" if you can, then match course and try to gain slightly untill your about 350m astern (depending on visibility). Then I use a 2m shallow running steamer set to impact and hopefully take out the merchants screw - ability to manuver. This typicaly won't sink the target so you have to manuver for a finishing shot. Much easier on a slow or sitting duck.
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