Hi there . Idk about "pro" DRG's , but i myself using Jump & Spineshatter Dive in between combos , using Dragonfire Dive for Aoe , also Spineshatter Dive & Dragonfire Dive good to use for reach enemy or group of enemy fast (like Coil t4 etc) . Also Jump itself with Job ability's up doing good chunk of damage . There few situations i noticed is when prefroming "Jump" is not good : when Enemy doing special move (red indicator) or Aoe move , or Plume (like Titan) etc , because seems while Animation of "Jump" going - game thinks that player still stand in position , from where jump was actually performed D: .
Also not to forget "Elusive Jump" is good tool to fly over big toxic pools like CT