Got it. I stumbled across it a few weeks ago, and bookmarked it.
http://www.subsim.com/phpBB/viewtopic.php?t=41126
The stuff you're interested in starts about halfway down the first page. Hope this helps. I've only seen one liner, but it was in the middle of a convoy and I was completely out of torpedos.
EDIT: How much longer am I a bilge rat?