This part, from Captbones post, is interesting.
"Surface factor means how much surface area of your sub you must be presenting to the AI in order for him to notice you".
It might only concern the aspect, but it's on the right lines.
Periscope height, is another one. Is it purely up or down? I always keep it as low as possible. I will continue to do it, even if it makes no difference.
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