I think a more suitable solution would be just to make more BLM friendly content. Maybe some content involving less moving, or maybe 3rd coil can feature multi-bosses or something so AoE is useful? There are plenty of solutions that don't require nerfing other classes or buffing BLM more than it needs(lets be honest, it's pretty OP over all).
Besides that DONT YOU DARE TOUCH MY DRG, SE!! It's hard enough to remain competitive DPS-wise with the insane rotation we have >_>