Well i have a strategy with Gault. He can single-target tank due to his high damage, I take on the rest of the damage. After he takes out the hardest hitting mob I set him on, he picks off the weaker ones one-by-one in the same fashion as the first, taking it's aggro and destroying it. My heavy armor nulls the damage from the weaker mobs, meaning i dont need much healing.
If gault had them all on him at one time, he'd be dead before I could heal him.
It's a bit complicated, but it's never failed.