I'd also recommend Brayflox. To be clear, Aurum Vale is still the fastest. Straight up, there is no arguing that. Just blitz through, kill bosses, kill the big Morbols, chuck Piercing Talon at everything else as you move along, and abuse Spineshatter Dive and Dragonfire Dive to close the distance on Morbols. That said, do check if Brayflox is on double Light because it is really fast. There's a brief detour to grab a key at the start of the dungeon, and two doors to open, but other than? Super fast to mow everything down, and it has good Sprint timings (start, after second boss, after third boss). A run will typically take about 3 minutes so it's slower than Aurum but faster than Tam-Tara, and on par with Stone Vigil assuming you one-shot the final boss there.

So yeah, go Aurum Vale. Back during ShB I was getting my runs around 2:30 on most Jobs, up to 3:00 on some. With the Epic Echo and level 90 gear, 2:30 should be easy for everything. Hell, my BRD can do it in 2:00 whenever I need a 1-49 Dungeon for Wondrous Tails. Have fun Light farming, it's a hell of a lot faster than the Book phase.