Everyone has their own play style but typically all I use is the souleater combo.

I'll start on the melee to build up gauge and give my team time to build their burst, then I'll switch to healer and stun/silence stagger them.

I always throw out blackest night whenever I can on my dps/healer so I always have silence ready.

Everything really depends on the flow of battle. Typically i stay on the healer and force them to heal themself. Other times I'm stunning the dps to give my guys a break.

I use unmend to pull the healer behind a wall or to pull a dps off my guys when needed.

I'm also a little unethical with my traits and use tp/mp recovery and skill speed, and for abilities I use purify and sprint.