Fire/Poison Mage Builds Post-Big Bang?

I'll expand on this post later but here's a quick sketch of a build I came up with. Won't be using it myself since I'm already 15x, but I think it's the best way to build an F/P.

1st job
1 Bolt
Max Magic Claw
Max Magic Armor
Max Magic Guard

2nd job
1 Teleport
1 Fire Arrow
Max Mastery
Max Fire Arrow
Max Teleport
3 MP Eater
Max Meditation
Max MP Eater
Max Slow
1 Poison Breath

3rd job
1 Teleport Mastery
1 Explosion
3 Elemental Amplification
6 Booster
Max Elemental Amplification
Max Poison Mist
Max Teleport Mastery
Max Explosion
Max Elemental Composition
Max Elemental Reset
Max Partial Resistance
11 Seal

4th job

1 Paralyze, 1 Meteor, 1 Big Bang
Max Buff Mastery
Max Paralyze
Max Big Bang
Max Infinity
anything but Mana Reflection

I don't see the point in dual channeling, changing channels takes longer than waiting a couple seconds for more mobs to spawn.