The main problem won't be about the attack but escaping escorts.
Several factors are important here:
-The year: 1940 is a good point for you. Year after 1941 would be a no-go
-Your type of uboot: A type II is better than a IXD2
-Your type of playing: If you play DID then you may think twice about losing everything
-The weather: 15m/s and storm conditions are better for you. Attack may be more tedious but escape will be far more easier
-The force of the escort: more than 5 escorts you should abort attack
But wth are you doing in AN76??? You should choose better hunting grounds...(heavy asw patrols, mines, shallow waters...)
So with an horrendous weather in a tiny type II with three escorts i would go. Otherwise i would abort...
Hope it will help!
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