So in true internet stalker fashion, I searched your character info. If what I am looking at is your current tank gear, take a moment to reconsider running dungeons. Your left side is what you must upgrade first. ALWAYS try to have the highest possible gear for your left side possible. You are level 47... do your Job quests to level 45, where you get your Artifact Armor, and then get a belt and chest piece until you hit 50 when you replace your chest piece. This gear will be sufficient enough for dungeons level 47 and below.
Now, consider carrying two sets of trinkets. One Vitality set and One Strength set. Agro in this game doesn't work on just damage + a flat amount of enmity. It works on a multiplicative formula based on damage. Even Flash from a higher geared tank will cause slightly more enmity than the lower. It is generally believed that Rage of Halone has a multiplier of x5 on it, and that Shield Oath has a multiplier of x2. So if you do 100 damage with a Rage of Halone without shield oath, it should equate to approximately 500 points of agro instead of just 100+ a set amount. This is why, quite often, I find I take agro from high ilvl tanks using Shield Oath, when I'm in Sword Oath myself when I run DPS trinkets and they use Vitality trinkets.
Also, others have stated, and I guess I'll reiterate. Provoke has no duration, it's simply a one shot effect where it puts you at the top of the charts by just a fraction. To handle this, use Provoke in certain situations and combined with certain skills in different situations. It's generally a good idea to use Fight of Flight before popping Provoke, since your damage out put will be increased by 30%, and thus your enmity out put will be boosted even more. For obvious reasons, the active skills you will want to pair provoke with will change. At range? Shield Lob is usually the skill of choice. In melee? Wait for (depending on level) either Rage of Halone of Savage Blade. So it should look something like this from range. Fight or Flight -> Provoke -> Shield Lob. In Melee, something like this. Fight or Flight -> Fast Blade -> Savage Blade -> Provoke -> Rage of Halone.