I would say it's probably feels squishy because your meant to spam your soul eater while Mt so you self heal more then say a warrior. If you open with dark arts buffed power slashes I usually go for 2 you can literally spam soul eater unless you have a yolo tank fighting you for main hate. So you use dark art to buff soul eater for the extra heal/damage and apply delirium as necessary. Haven't noticed an issue while being MT.