First thing's first, it's also important to tell us what nation these pilots belong too because certain nations have special bonuses--USN in particular has better special force bonus AND fighter bonus so it's like a +3 fighter.
I wouldn't keep them as rookie pilots for the sake of crew growth as that wastes on ability growth bonus. Instead, get them to fighter/bomber class on time THEN you can consider delayed growth (besides you'll lose out the fun with blitz in a CV). Based from what I hear, if you want 200 vets on your pilots remain as fighter but you want your garden variety, cookie cutter, 100 vets, promote to Ace; the differences for this is almost negligible . NEVER go to Squadron Leader as that's where crew growth penalty starts to hurt.
For the exact mathematic details, I recommend asking richardphat, he has posted something about the exact details for this, esp. the USN chart. V2CxBongRipz is the other guy I recommend since he's a vet CV driver.
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