BRD/BLM have the highest potential DPS

but they're the rng dependent jobs - a lucky streak of procs on either job and they're going to pull way ahead of the best played drg or mnk

on the flip side, a drought of procs is going to put drg and mnk ahead of the best played blm or brd

BLM moreso here, bloodletter resets should be much more steady for bards than the mage praying for a thunderstorm proc (not to mention firestarter)