Tiberium

You are not getting enough Death sweeps or Annihilation's into your meta windows is the simple answer. You cast eye beam 11 times so you want to fit 2 death sweeps into that meta window that demonic talent gives you but you only had a total of 12 death sweep casts. So that's tons of damage lost + the damage lost by not using it enough in your 30's Meta window. Death Sweep if your biggest hitting basic ability you should be using it when ever possible regardless of number of targets. Once you have used eye beam you next cast should be Death sweep and it should be used on CD so y

really large part of furys damage comes from auto attacks. http://www.wowhead.com/item=134542/jeweled-signet-of-melandrus&bonus=1826 this ring from court of stars is really good. might be worth trying to do some runs to get one and try it out. stats on it are also nice for fury

1. dont use warbreaker to open. you should only use it if CS debuff is about to fall off and CS is on cooldown. 2. generally i try to keep good uptime on CS rather then spam it on cooldown. CS gives you Shattered Defenses so as a rule you always want to have 3 stacks of focused rage and shattered defenses up before casting mortal strike. Arms atm feels like hits really weak unless CS is up and mortal strike feels really weak with out 3 stacks of FR. 3. if using anger management you can line up BC and Avatar more often so try aim for that. generally the 3rd bc you can use both toge