How to down turn 5 as a bard?

[Bardo]

Phase 1:
Play Foe Req to kill the adds faster, then swap to a short ballad after the 3 adds are down to top healers going into phase2.

Conflags:
Turn songs off to regen mana.
Use Internal Release and Raging Strikes together on the first "fast conflag", then use B4B, Hawk's Eye, and Barrage together for the second "fast conflag".

Divebombs:
Get ballad back up right before you run over for divebombs (Battle Voice it if the healers got lower than half mana during phase2)

Snakes:
Turn songs off to regen some MP so that you have enough to use Foe Req when Asclepius has 4 stacks of the debuff on him.

Twisters/Hatches:
Try to position yourself close enough to hit both healers with Ballad if necessary.

Other than song and buff timing, there's really nothing special for bard.
Just place fireballs/conflags correctly, avoid divebombs/twisters, and stay away from the middle in phase 4/5 just like everyone else.