I'm trying to think of a situation in any dungeon where you're AoE "tanking". In most cases, things are going to die too fast for you as a PLD to tank mass trash mobs. In these cases, you're just better off gathering them together then covering a BLM.

When it comes to rings, it really depends on what you're fighting, but I favor two accuracy rings just to make sure my Phalanx's land for Spirit's Within. I didn't feel I was getting very much out of my Amber Ring +1.

Your bracelets are good. Your necklace is good for the time being. See if you can get a Militia Choker. Stonewall earrings when you can. On your belt, when you can afford to, get a double enmity meld. Also meld enmity into your Cobalt Winglet if you can afford it. Can't hurt.

Personally, I use an Ul'dahn Winglet because I favor Accuracy and the additional MND and Attack doesn't hurt. Beyond that, once you start double melding armor items, you can begin replacing AF.

I use a medium cobalt set for my body and feet. (Haubergeon, Sollerets) and heavier stuff for my hands and waist (Gauntlets and Plate Belt). I also use Felt Trousers. My body, hands, feet, and legs all use double HP materia tier III and IV. I favor an HP set with a slightly lower DEF, but I feel my shield abilities make up for that loss in the long run.

My accuracy on PLD sits at about 401. Hasn't failed me yet.