Which weapon?

[Fadigre]

On the topic of Excruciate, how does the bonus work exactly? Does crit rate increase with each spell, or does it increase over time? If my goal is to land a crit with Thundaga, am I better off using Excruciate before Thunder, Thundara or Thundaga in a combo?

When using my combo I normally rop Excruciate before Thundara. I also drop Parsimony, Quelling Strike and Dark Seal on Thundaga however you may find yourself short on casting time for your combo if you're not fast!

I used to use Excruciate with Burst but as a result my next Thundaga would be staggered.
As Thundaga replies on it, I always save Excruciate for that.

On top of that after if I need to convert I cast up to Thundara, then use a macro to swap out my head for BLM AF, use Convert, swap my Electrum monocle back in, use Necrogenesis and then start casting Burst on the mob.

If you're not in a long fight though feel free to throw Excruciate about