Heh, I've seen a few threads talking about trying to sink multiple high priority targets. I think if that was me, I would have put two in the Nelson, and two in a tanker, shadowed the convoy, and return again later.
Not that I haven't done similar things, but I'm starting to realise that every time I try and be too clever with an attack, it always (and I mean always) seems to get me depth charged.
Shame you didn't have more torps. Bet you would have been straight back in if you did.
I always enjoy reading these on the forum, whether they work out in the end or not, so thanks for posting. Good fun