If you ditch the boat, you don't get the renown. None of it. Same with if there is bad weather and the damage it does sinks the ship instead of your torpedo flooding damage.
Once you sink a ship, the correct data will be logged. Even if you identify a King George V as a trawler. presumably your crew takes a look at the ship as you sail away and silently change your books.
Have you ordered him to follow the contacts? If he isn't sweeping, he can't really hear can he?
The contact line will stick around, not moving, but the ship probably still is. Like how you can see the little boxes when you submerge, but they don't move at all.
And early war torpedoes will run at unintended depths, just set it to 0 to be safe.
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The entire German garrison of Vanviken, right here in your thread! 
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