You're only getting partial credit because you're not getting doing enough damage / aggro. Make sure you're in a party and that everyone is spamming high threat abilities.

WHM is best. Just spam Cure 3 / Medica like you don't even care about the fight.

But it looks like you're dps so do as much damage as you can and make sure you're grouped. Ask for invites or look for hunt parties in party finder.