I don't play BLM (I do have a lot of experience of DPSing in 1.0 and most other big MMOs, though), but I have to agree with BrandoH. Missing every now and then will make a negative impact in your damage that critting a very marginal amount more often will NOT make up for. Stick with the accuracy food until you hit accuracy cap from the natural progression of your gear upgrades. Imagine if you were unlucky enough to score a miss on your blizzard 3? That would really throw a wrench into your DPS rotation. Always cap accuracy first!