What I do is this: As I start overtaking the convoy the ships appear to open up, or close behind each other as the magnetic bearing to them changes. When the ships are agreeably open, I make a note of that bearing, and that becomes the bearing I turn onto having got well ahead of the convoy. After that, if you wait as the convoy passes, there will come a moment when the ships you want to attack are nicely opened out.
As part of the same routine, I determine the convoy course, and an "escape bearing" based on the presumption of a crash dive after firing, which is usually plus or minus 60 degrees of the convoy course, as a heading. So, if the convoy course is 245 degrees, then my heading out once submerged is 305 degrees (starboard side of convoy) or 185 degrees if attacking from the port side. After a 15 minute submerged run on this heading brings you outside of escort visual range (at night!) and outside of the escort screen.
There may be faster, better strategies for those who can fire without the TDC "from the hip" at wriggling targets, but I like to keep it simple!
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