I'm not one who looks into the actual details of things. So does Haste on BLM from /RDM still fall short of Dark Arts reduction to recast etc? I tend to use Gravity and Phalanx often on BLM as I normally solo to cap azure while everyone is setting up and getting pops for boss. Technically a BLM can just play with Sleep and Sleep II (or even the sleepgas) to negate needing Gravity on most things. And it's probably safer that way (even with Gravity, some mobs like to close the cap a bit quickly, and on spell-casting mobs if you didn't stick Silence, or it's worn. It leaves you open to damage).