Ask a Magician Thread.

I don't believe many F/Ps have tested going with explosion after it was made faster. It did indeed increase significantly in speed, but I still believe poison mist training will be much faster (if you can afford it).
You could go explosion first and delay mist training to levels 90-100 where it starts getting easier (more hp/mp and having booster and explosion help it) and explosion training gets slower.

The only problem with explosion training is that, unless you are low-luk with a very good evil wings you will be limited to either a weak weapon or a slow weapon (until the level 103 estaff).

PS: Anyone care to upgrade the attack speed tables for explosion?

After some consideration, I actually went Amp first, and I don't regret it at all. Fire Arrow is a VERY good skill now. 180 power 3 target attack? Yes please. I'm training at Blue Kents at level 77, doing 8-9.5kish on 3 at a time and getting about 75%/hr on 1x.

Planned build:

20 Amp
11 Booster
Max Explosion
Max Poison Mist
Max Amp
Max Booster
Max Seal
Max Partial Res
1 Composition