I had a look at your heroic Triliax, firstly don't die. Big dps loss. But also you take Frothing Berserker and you only have 26% uptime. I have no checked but you might we using rampage before you can get to 100 rage. So if you take the talent always wait until you actually have 100 rage then Rampage -> Raging Blow etc.
Also you opener could do with some improvement. BC/Avatar/racial -> Ramapge -> Raging Blow -> Odyn's Fury -> Bloodthirst -> Raging Blow. It seems you are having problem with the rotation, have a look at the WoWhead guide.
If I look at Auriel then the logs show me the same issues, you have 15% up time on Frothing Berserker, with such low up times you would be better off playing Massacre.
Keep in mind if you play Frothing than your execute phase will have low up times enrage and Frothing but that is ok if you use the BC window with a lot of juggernaut stacks.
Can you tell me when you sim an item what option you use on Simulationcraft?
Find a friend that's an alchemist and has rank 3 on potion of old war. Farm bloods by doing your daily heroic/weekly mythics and any world quests that drop them. Then go to the blood vendor and exchange the bloods for mats. Give the mats to your friend. Your friend that's rank 3 procs on the pots and you get more for less.