Looking at your o2s fights, the issue isn't your rotation. It's a combination of less than ideal uptime on the boss, not riding the gcd hard enough, and saving your off gcds too much(in your best run you only had 13 elixir field uses despite the fight going 10 minutes). It is possible that part of those problems are on your tanks or on your groups strategy though, so little things like making your tanks take the boss north or south after the probes if the safe spot was east or west, or making sure the boss is near the center during the dps unstable gravity will help as well