You should try the runes of the earth, they are simply amazing.
I've considered them, in fact, I was looking at them yesterday, but Runes of the Pack just give me so many things that I really want in this build. Power, Precision, Swiftness Duration, and Boons that stack well with Signet of Rage. I'm pretty set that these runes are what I am going to be using in the near future. If I decided to run a tankier spec with a hammer, I may get some different armor, and put runes of the earth on there.
Additionally, it didn't seem to me that "Shake It Off" was really doing a whole lot for me, so I have switched to using Empowered in the Tactics tree, which is incredibly helpful to increasing damage output since you have 3+ buffs up the majority of the time in combat.