To answer your question: No, No, Yes.
Indeed SS experience is relatively low compared other ship types and that's because of the Experience nerf that you get from torpedoes. Also, GB2s yield less exp than GB1s for subs (correct me if im wrong). Subs are easy to obtain, easy to play, easy to piss off others. Consequently, NF nerfs your exp gain for having so much fun. ^^
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