Leave the escorts be. Sinking one will just p*ss the surviving escorts off & probably ruin your chances of sinking a better target (ie. Large Merchant). Don't be impatient; ie. by using TC: short of surfacing, this is probably the worst possible thing that you can do. Wait for your victims to come close to you. Regularly check with your hydrophone operator for the location of the nearest warship so you can "keep an eye" on where it is & what it's doing. Once you have fired your torpedoes go deep & sneak way from the convoy. As soon as the escorts detect a torpedo impact they're going to move to that area so don't linger at periscope depth to watch the results of your attack.
P.S. While enroute to intercept the convoy, you may want to adjust your torpedoes (fuse type & depth) so that you don't have to fiddle with them just prior to your attack.
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