4th job Single Target DPS

Ultimates ought to be considered since it is plausible to use them.
Quantum Explosion possibly for situations of Elemental Disadvantage/Neutrality? 2000ms Charge time + cast time.
Otherwise, nothing else would likely be used at a boss.
LUK-less use either INT Saunas/Bathrobes or whatever the highest LUK Robe they can wear that's scrolled for INT. Commonly, Starlights come to mind.