I've never paid much attention to those rings...
Best way to get inside a convoy is to get way in front of it at a safe distance, then submerge and wait for it to sail over you.
Stay at slow speed and stop before it passes over you to make sure the destroyers don't hear you.
Then fire as many torps as possible before diving the hell outta there when those destroyers come.
I don't think BdU will give you a slap on the wrist for downing a cruiser, that's what I'd be going for. It's a judgement call real kaleuns would have to have made, and I'm sure most would have gone for an easy military target like that.
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