i've gotten over 150k attack in my sub with only 15k xp, km ss4
same time back in gb1 with ss3 before ss4 came out, same kind of attack or less I got in the 30k xp- only reason my sub bo is 96, well i did bo reset he is now a bb but thats besides the point
i found if i use my flak guns on an unsuspecting cv i can achieve over 20k xp im guessing its due to the guns and not the 30 torps i used up.
ugh perfect example played last night im in ss3 ijn low lvl crew just got the ship. i lucked out took out an l2, ad,h39 and some small ship, basically the entire north team. i died. we won, and i only got 8-11k depending on sailors want to make me tear up. i did so well.