The Flesh atronach is the most powerful ultimate so I would use that over the revive. (you level up revive in case your team is having trouble)
The necro ground-based heal over the time the first slot on bar one, is worse than Grand healing from the resto staff line without a consistent way to get bodies.
The fear totem reduces armor and spell defence, it is short-ranged but very powerful. I cut mutagen for it.
I have the heal tether on the front bar as it gives a passive healing bonus and the bodies absorb on the front bar because it gives you a defence bonus.
As for gear, I have olorome and twilight remedy (because I have 4 synergies) but also carry worms.