I only have UK SS2, whilst it does have 6 forward & 2 rear tubes, it does seem slower than most other subs. Putting on a lvl 95 engy gives me extra 2 knots overheat, so 24/30 on the surface, 20/26 submerged. Some T3 + T4 subs can OH to 40 knots above water!.
For crew, you have the right mix, but SS2 can also fit a repairer. The only stats that stack for all crew is repair/restore, not engine. BO + Sonar - at least 10/10 rep/rest, 14 Pot is plenty for Sonar. Planesman - Try get 15 pot, also with 10/10.
The 2 most important tactics for a sub are surprise & speed, so you'll want plenty of exp/vets on your planesman & engy. Submergance time is dependant on the what tier sub you have, that's why most ppl skip the SS1, also why your planesman is so important in re-filling those air tanks quickly.
I agree with Challen about not classing Sonar beyond 2nd class, but maybe not the Planesman for reasons above.
As for tactics, I can only suggest some basic tips: - Stay on surface when not in range of enemy BB's etc - Hide under clouds to re-charge your air - Pop up under enemy CV's with no guns to re-charge air - Save your OH to close the gap faster to enemy BB line - Try hitting AW BB's first (minimum bulge - UK), IJN BB's last - Avoid other subs in lower tier subs, DD's & FF's - Try to learn best situations to use slow/fast torps - You don't have to sink capital ships to earn good exp, just hit them - Keep an eye out for BB's already hit by TW's & TB's, they will have less bulge.
Happy hunting.
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