4th Job Brainstorming

My build planned:
120 1 Air Strike 1 Advanced Octo 1 Battleship
121 3 Battleship cannon
122 1 Rapid Fire 2 Battleship Cannon
123 3 Battleship Cannon (thats how far I am atm lol)
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124 3 Battleship cannon (11, wee 4 cannon balls)
125 1 Rapid Fire 1 Elemental Amplification 1 Battleship Cannon
126 1 Rapid Fire 2 Battleship Cannon
127 1 Rapid Fire 2 Battleship Cannon
128 1 Rapid Fire 2 Battleship Cannon
129 2 Battleship cannon (20, have to get lvl30 book yet >>) save 1 SP.

Didn't think any further yet. But why this? I lag quite a lot so I can't dismount before I get attacked, and the HP of low lvl battleship is pomegranate. So I want to be strong in the 2 minutes outside of ship of course. Rapid Fire is a excellent skill imo, lvl1 rapid fire kills a newtie as fast as Burst Fire, so lvl5 should beat it by far.

It may seem faster, but Burst Fire does roughly 109% damage in the time it takes to fire one bullet with Rapid Fire. Rapid Fire does 110% damage at level 5. You'd get a bigger damage improvement by adding like 10 dex. Training with Rapid Fire consumes 30k bullets in an hour if you're constantly spamming. I'd prefer to hold off on using it until I'm at a high enough level that my Battleship will last long enough that I won't have to use RF much. I dislike the idea of expanding my USE inventory, and don't want a crapload of ammo crowding my inventory the way NLs do, so I carry 10 sets.

I'd get 1 Amp before you go any further...at least right after you get the 4 bullet Cannon.