My guild is having trouble with single target damage on blast furnace. I was running demonbolt for that fight, but I'm considering going dserv/goserv. I'm curious what others think is the best option. I feel gimped phase 1 with dserv/goserv and no felguard, but demonbolt just isn't getting the job done for me. For reference, I was going glyph of dark soul and going to 2 stacks of dbolt debuff, then SF spam.