I'd say your good to start Heroic ToCr. 10man for sure. Maybe even 25m.
Personally I like devastate glyph over last stand... 3m is good enough for me in ToCr, and Taunt over vigilance. The devastate glyph will make up for the tps loss on vigilance. Missing a taunt on heroic gormok is bad.
Also I prefer Focused rage over shield spec for raid encounters (especially tocr where there's no trash.)