IMO immediately returning to attack a convoy has more downsides than pluses..
Many times the ships will begin unpredictable maneuvering immediately following a sinking making a successful shot much more difficult... they will resume a more consistent, predictable course 30 ish miles downrange
I usually sneak off and if there were more juicy targets left behind, shadow the convoy on the surface 6-7 miles parallel while the crew reloads the tubes, then set up again for another attack.
DDs after an attack can be distracted to an area where they suspect you were, leaving the convoy unprotected, so if the merchants aren't spinning donuts in the water, it may allow a follow up as soon as reloading is completed...
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