Path Trial 7 Silkbind Deluge

Is this challenge even possible under the new event? I'm a pretty well geared pure healer and mostly legendary on all slots and am having issues with the teammates. Even when I full commit to healing and keep them topped up to 100% they die to lightning strikes from full HP at some point every run even through burst healing. Golden body 100 vit cost is only thing that seems to prevent but it's not up for following strikes usually.