Well FB is the standard fare.
5-6 fighters and 2-3 bombers + seaman or other support. 

Well CV exp is generally worse than BB but more stable so the average should be more or less the same.
Also when leveling on a PCV you can level the entire CV6 crew in one go unlike leveling tem on a BB where you either immensly gimp yourself or level 2 pilots at most.

As for the PCV... 

It's the highest level PCV so you suffer a lesser exp penatly when closing to lvl 120
It also has the largest planespace (12000) tied with MN (12020).
It's also pretty slim and since PCVs have a ton of turning force it has a easier time avoiding bombs and torps.

IJN Has one of the worst fighters for CV so FW'ing isnt gonna work unless you have really good fighters.
Set-up should be 2-3 Fighters and rest are DBs. Bombing CVs first in GBs should be your priority. Only send fighters if you need to scout a certain region, Escort your DBs or fend of Fighter Whores. 

It wouldn't be Ideal for BB crew lvling unless you only need to level 2-3 sailors for amagi. 

Do your best to avoid fighter combat unless you know for sure you can take out the figthers without taking too much of a loss. Taking out scouts and Taking down enemy CVs as I said should be your top priority and bombing other ships should come later.

Remeber that you aren't a God like a Tico, so you aren't going to win most fighter engagements. You only scout for your team if your BBs are getting fighter camped.  

Does anyone know if the zuikaku is a CV 5.5 or what? also how many sailors can it hold aboard? I'm assuming 1 BO, 2x gunners and it says 9 support slots.. so a total of 12 sailors right?