Generally, I move ahead of where the convoy will come from and sit at periscope depth, engines stopped and on silent running engaged (to shut the crew up!) as close to perpendicular to its course as possible.
Once the lead escort goes past, I move forward at two knots, sometimes passing the outside row of ships. Then, the 90 degree angle makes calculation of AOB easy as... and prevents my torpedoes from bouncing off the ships' hulls too much.
If the range to target is less than 1km, I can be reasonably certain of getting at least one hit.
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Using GWX 3.0 at 100% realism, OLC's 'Ubermod' & Torpdamagefinal 
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