I am not an expert on sub i only play it for this fight. it is a prio system. first you spend cps in snd then recuperate then rupture and after that you eviscerate to refresh rupture. It is important to keep your eyes on the timers and refresh them when they are about to fall off. addons and weak auras help in that regard. good luck!
Good shit dude. This boss has been a nightmare for progression in my guild. We've invested hours totaling around 90 pulls on this boss and got her down to 1% one pull. We watched this vid and the boss died shortly after. Ty for the quality post!