if 3 eob's doesn't gather all adds and make them your mortal enemy then you are not in determination. Also Positioning is critical to tanking. Put all adds once aggro'd in front of you and turn them so thier back is to the dps and if you are off tanking be 10m or more from the main tank and in a different group. If you are in the same group and the MT then don't use aggression or conviction. Also Call to battle is great for adds as it can aggro the target plus all within 10m of the target from 25m away.
Welleg , Kelleg, and Gelleg - Crickhollow
WARNING: leveling a warden may cause you to neglect your other characters.