I approached your method several ways this phase. Tanks on A, Healers on B, Melee DPS on C, Ranged on D. If there's more than 2 melee DPS, then we'll assign.

EVEN THEN, they are disoriented on where to go after Swift Liberation. I think it boils down to, everyone rushes to the middle as fast as they can after the dash, when they don't realize the safe spot is also the areas after he dashed. For example, after he dash from A to B, then A area is cleared. Once he goes from B to C, then B area is cleared. Not everyone have to rush to the middle.