I take that back..
If anything, make sure that Tater's IJN radar fix is in. That'd be my first suggestion since it's a huge bug fix.
http://www.subsim.com/radioroom/showthread.php?t=120873
As a suggestion, you might put this in and take a second look at the AI detection settings you have. You'll get a "oh damn this stuff matters again" feeling after Tater's bug fix. 
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