I think what people fail to understand is that by the time A U-boat puts to sea for a patrol the crew has had a minimum of six months of training at sea in the Baltic during sea trials, becoming proficient in every mundane task.
Sure there is room for improvement but probably not much as these guys could crash dive a sub in their sleep by the time they were sent out on a war patrol.
The Captain and his choices probably had more to do with the outcome of any situation than crew ability.
But what would be interesting is having crew get injured or sick as U-boats had no doctor aboard it could effect the efficiency of tasks.
Say you have the deck gun manned in heavier than norm sea's, what would be the risk of crew being swept overboard or slammed against the gun or tower by a wave?
Or riding the surface and its a huge storm, guys inside the boat would be thrown around risking injury.
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