Class them when they reach the available 'rank' as soon as is possible. with regards to not classing them to get a larger crew size, thats great if you can super-vet them to take advantage of this and keep it up (which will require ever increasing amounts of real $'s).
If you don't wish to, or can't afford to, then it's easier to just class them on time to take advantage of the improved ability you get as a result of the class-change (for me, i have multiple CV crews with a large number of fighters -21 currently, spread over 3 nations, there's no WAY I'm going to even contemplate super-vetting all of them, when 100 vets do quite nicely against most CV's on AZ).
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