Probably the worst thing about the tank roles is that they've mixed defensive cooldowns with utilities, and some of those utilities are not optional. So to meet the baseline requirements for a fight, I have to give up on the abilities that my job is all about. That makes no sense to me.
Also, stop trying to add an aggro lock to provoke. One of the best things you can do in 8-man content is provoke+shirk to get a nice aggro boost, tankswaps are fine because I can simply save up the third step in the enmity combo.