Yes it is but you still have the wrong meta gem so, go for 32 stamina and 2% armor value. Improve your gear with enchants aswell if you wanna make it easier tanking.
For heroics the most important thing is that you have 535 defence. After that, you should focus on stamina before starting to focus on avoidance.
So if I were you, i would get as many stam gems as posible without getting under 535 defence. And i would change your dodge trinket with the defence trinket from normal HoL wich would allow you to gem for alot of stamina.
Upgrade your chest to the T9 that actually has defense rating on it, enchant your shoulders with the Sons of Hodir enchant, and you'll be able to replace your defense gems with stamina ones, switch your meta to the Austere Earthsiege Diamond (use an agility/stamina purple gem in your head to activate it, as well as pick up the socket bonus).