I completed it on the first try by running flank and gunning down the boats, no fancy things required(TMaru+RSRDC+NSM3.3, 100%). I did the gunning mostly myself, until I was close enough to use the AA gun properly. The mission would imho be a lot easier if the gun were at the front instead of the back, because now you basically can't shoot until you're past the enemy. You could also possibly try going around the last few boats by using the channel in the south, although I'm not sure if it's wide enough for your sub.
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