Personally, I would rather saw off my own foot than take points out focused rage purely because I CAN rage starve myself. Easily. and it happens often. That said, each to their own.
I dont mean to sound agressive and I am sorry if i have offended you in some way but, and i can not stress this enough, there is not a "single solution" to this, or any other problem regarding specs anymore. Everything that you can spec into is able to synergise with something else.
Another point i would like to raise in regards to this; Rage efficency and threat are virtually the same thing. The more that you can do something for the cheaper you can do it, the better the results. Personally i would even possibly spec back into puncture for my threat build.
after all of that, i would like to say that ultimatly, IT IS YOUR CHOICE. I dont mean to be saying you are wrong, because you cant be. Such is the new tank strategy. Comments along the lines of "this is the be all and end all solution to this problem" are not helpful in my honest opinion.
If i have taken anything the wrong way or dont make any sense at all, i am sorry, it is 3 am here and i dont know why i am still awake.