Personally, I think if you replace the Drg/War with a War/Nin, and one Dnc/Nin with a Smn/Whm, you'd have a "failproof" party. I think you're a bit lacking real good damage right now and a worthy tank. For further info and strategies I also suggest you visit this site:
Ffxiclopedia.org
And also on
Youtube do a search for "ffxi promyvion", you will find plenty of video's from the boss battle.
The best advice I can give is plan all your anima's good, they can make the battle a lot easier.