I did Titan HM last night on a Goon. We had a 2 melee, 2 ranged dps composition. We wiped twice. Cleared it on the 3rd try.

Wipe 1: Titan tail feathered plumes out from himself, both Melee died on the platform, the group wiped for shortage of dps.
Wipe 2: Titan tail feathered plumes out from himself, both Melee died on the platform, the group wiped for shortage of dps.

Clear: All plumes spread on the other side of the room, ranged dps kited them, melee never saw a plume, the trial ended.

Pure RnG.