I usually approach directly facing the outer columns of the convoy at PD, silent run (2knots tops). This puts me *just* outside the DD's active sonar rance (~1000m). Once I'm within ~6000 of the lead DD I dive deep (150-200m) and wait until the lead DD passes. If at any time he flanks for me it's a game of get the hell out of there. If not, my approach will put me on a collision course with the outermost column. I turn inward towards the covoy to line up shots at an ideal angle (as close to perpendicular as possible). Then I let loose my torp load (while making sure my course is steady -- wouldn't want to throw torpedoes off track) and afterwards I complete the turn, lining up the stern tubes for a shot at the outermost column. Note that this is quite difficult to pull off with Manual Targetting.
As long as you're not within less than 1500m of the DD at any time, you should be good. I might slow down to 1 knot while the DD is really close (under 2000m), but I'd never stop. I'm one of the guys that thinks stopping is bad.
The escape is the tricky part, but I usually go underneath the convoy to throw off the escorts. It WILL take a while.
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