Gunslinger Build (Lv. 10-200)

Whats the preferred 4th Job Build for Corsairs?

I think Imma go with

the Battle Ship Cannon, then Rapid fire, Homing adv. and Maple warrior, then torpedo, and leave my octo and air strike and elemntal at lvl 1 till later on.

Ps: I found Battle Ship Cannon 20 Today in FM or only 3mil. I was so happy I couldnt find it anywhere.

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I see you have Air Strike really early in your guide...

I don't think its that helpful maxing it that early.
In all the vids I've seen, its not a full screen attack, and only hits monsters way above.

Like if your standing in the middle platform of newties, itll only hit monsters on the platform above you.

Is this true or was it just my eyes?