If you're not planning to RLD cap the A variant of the trip 6", classing them now should be fine at your lvl.
On a related note, if you really want super competitive IJN DP gunners, lvl a pair of elite reps and leave them as national sailors until lvl 120. Even with national xp, the grind can be quite unforgiving if you're just playing casually but it pays off massively if you have the excessive time and patience especially if you're seriously aiming for the ultimate IJN BB/CV crew. They will still RLD cap all IJN AA except for the trip 6" but personally, its gunset is just not widely usable on most ships to make it supremely effective.
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