Dragoon DPS Question - When to Chaos Thrust?

[Eidolon]

You mean the Shadows? That's fast enough that your attacking them at all is probably inefficient. But then you have to plan for either holding DPS or dealing with a Shadow in the next phase.

The add phase itself is a fixed length and once it's under control, anything you do better only comes at a cost to someone else.

I don't attack they breath fire, sadly. they sometimes do while I attack! So I just need to find a way to optimize it, because I'm a whore for big numbers