4.1k HP is a bit low even for 4way splits. There is always that chance of a crit right? I do 4way splits with 4.3k HP on my SCH and I get down pretty low if I don't have time to Succor before the hit. Also, have your ST keep StoneSkin on the healers and low HP DPS. The healers can SS people as well but the amount of damage that Twin can dish out in a short time is stupid so really we don't always have time to do this.