This is my own personal experience with it, but I currently make use of:

Stoneskin - It's 10% of your max HP and makes for a decent buffer, if you're healers can't get it on for you (or prior to big attacks). I also make use of it in cases where I am off-tanking (Ifrit stun duty, for example) to provide the stoneskin buffer to other DDs before major damage, or just for the sake of it sometimes. Once you have a lead on enmity, you can help out the healers by taking care of some of your own damage mitigation, especially whilst a mob is using a special attack with a cast time.

Fracture - I use this following Circle of Scorn. It's a little extra damage and damage is enmity on top of the normal combo. I start to use it once I have a decent start on enmity.

Foresight - +20% defense increase. It might not be huge, but it's better than nothing.

Bloodbath - It's slightly useful and it's an off-GCD buff so why not. It works better with Sword Oath up, seeing as the HP absorb procs on both hits of the auto attack and also because your damage isn't being reduced (sometimes you can use Sword Oath instead of Shield Oath, even when tanking - mostly when you are fighting single target mobs, or when clumps can be slept).

Then I'll swap in and out between: Raise (for dungeons, just in case), Mercy Stroke (it's a small amount of extra damage) and Protect (for those solo moments).