As a tank, you will want to hit the accuracy cap as missing combos will definitly scew you up. Then, I think electrum rings (+1) is a very good options for rings. I don't know about the explorer's choker, as it's pretty expensive but it gives a huge accuracy boost.

Try to hit also your VIT cap, which shouldn't be to hard considering what your stats are right now.

Finally, there's a few key pieces for tanking as war. I'm thinking about Sentinel's Sabaton melded with HP x2 or x3 and the cobalt plate belt with enemity materia.

As for DD, I'm also very clueless.