your strategies are great and many sub players should note that.
there is a better way to build the crew tho.....
a much better crew set up is
sonar and planesman, 2 - 13 potential 11 restore 10 engy 10 rep sailors (or as close as possible). the restore stat is important here because sonar and planesman cap early. class these to sailors as support sailors only for as long as possible. (this lets the restore stat grow). when you do class them, class to the first sonar or planesman class only.
torpedo x2 - they do not need to be elite or even a +12. torpedo is the fastest to hit its cap. a +10 torp +12 restore will be a much better sub torpedo sailor. as you class the torp it will lose its restore stat. if you start at 12 you will be left with +1-2 restore stat. (way better than negative restore stat). torpedo stat is the reload stat, no need for any reload stat on a torp man.
engineer and repair - these would be the sailors to spend olives on simply because of the lack of support slots. as always boosted +12 work great also.
1 restore sailor- this is optional but a good idea for your gun slot at lower levels.
now the reason why other players dont want you to know this set up. the magic SD.
SD comes from the restore stat, common knowledge by this point. the further you delay your planes ans sonar the quicker you get to 900 SD. i have even delayed the torps a few levels before.
900 SD in a sub is the difference between jacking people up and getting jacked up.
900 SD + a little time behind the wheel and people will fear your SS