This isn’t actually that necessary. The way the mechanics work is that every cleanse will clear the stacks before they reach beyond 2. The exception to that is when the boss spits his adds out the circles won’t spawn until the adds are gone again, so just save a major cd for when the red bar hits 100 if you haven’t had a cleanse yet and you should be fine to weather the storm until the cleanse comes back around. You got this!
Mass dispel is mostly for uldaman, halls of infusion, brackenhide (1st boss dispelling tank from totem) and vortex pinnacle.