When I tank WP, I tell everyone to ignore the adds and not use any AoE. Just focus on the boss only and let me do the rest. I move boss around the arena and have only died to this boss 2 times ever(out of over 30 runs). 1 time when I first fought the boss and last week when a BLM in a pug group did LB early which didn't kill boss thus damaging the adds which caused them to attack and stop following me.

Boss is super easy and fight goes fast since everyone is focusing only on boss. My 2 cents