How I'd personally fix dragoon:

- Increase the Magic Defence on all LNC/DRG gear to be the same as casters/healers or at least equal to other melee.
- Get rid of Power Surge (it's an annoying ability anyway), buff jumps to compensate, and replace it with an ability that decreases magic damage taken for nearby party members. "Dragonsward" or something.
- Change the penalty for performing Heavy Thrust and Impulse Drive on the "incorrect side" to a potency decrease.
- Add an additional effect to Dragonfire Dive which increases the duration of all DoTs casted by the party by 15 seconds.
- Slight increase in potency to Vorpal Thrust and Disembowel.

Also jumps are busted in final coil. DRGs will often take damage from "floor AoEs" such as Barofield on T11 or T10s electric field if they're unlucky with the server tick timing.