Just my personal opinion, I don't issue a convoy report as long I have any torps if I don't think I'll be able to satisfy the order to sink enough ships. I suspect you need to take out at LEAST one or more of the largest ships. These are usually in the center front or second row in a really big convoy. If I were in your shoes given that particular circumstance, I would have freelanced the attack without the report, did my best with the remaining torp and deck gun, then gone home.
-Pv-
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