I assume the super DCs is to make up for the limited ability of the AI(I assume to be intuitive and abstract). Without it, the AI would never be good enough to present a real threat to us.
The 40m radius is to likly to create the illusion of a very accurate drop when in fact the AI cant do it, or a lucky drop, or a DD skipper who intuitivly anticipates what the sub will do and places DCs outside of the normal proedure.
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