Yes you are missin.
Optimum single targetthreat rotation is:
restarting each time you get an SnB proc
Other is Concussion Blow> TC refreshing a rend with less tha 3 secs left Shockwave>Heroic Throw>Rend(if somone providing the bleed debuff>Dev
Dump with HS whenever you have the rage to do so while maintaining the above rotation and replace Dev with Rev if rage starts getting tight.
Drop the points out of Blitz, PvP talent and not a particualrily great one at that either, finish of War academy and cruelty. replace cruelty with thunderstruck if you're struggling with AoE. blue sockest sshould be puissant dream emeralds, red sockets should be fine ember topaz's, yellows should be fractured amberjewels, meta should be eternals shadowspirit diamond. get both you BS sockets on your gear, get your missing enchants, get some proper tanking trinkets, DPS trinkets are for DPS, Reforge out of hit/exp/crit/haste into MasterParry/dodge.