Higher level BO will not increase your Air time, this is fixed to the Ship. Better planesman will increase your air refill time, however I am pretty sure his ability is capped like most other sailors.
In terms of SS4 Torpers, I am not 100% sure on the ability of torpers, but looking at typical gunners, capped by level 74 would require a fair amount of BVE'ing, so I would say there is no guarantee that torpers by SS4 have capped.
In terms of leveling, unless you are seriously concerned with have a 120 BO there will be much better ways of leveling the crew. SS's are limited on crew number/support slots, use torpedos that result in reduced xp gains, and ship levels are well below high level crew.
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