You're right to correct me, but I'm dumbing it down in order to demonstrate that an 11% buff to one player isn't an 11% buff to the entire raid, because otherwise someone will see 11% and 1.5% and jump to conclusions.
A 1.5% increase to all players is the same value as a 12% increase to one person (assuming everyone is DPSing at the time), except that, as was mentioned by a DRG earlier, DPS don't want haste because it just makes them burn through their TP faster (maybe BLMs do, but I've heard that they have a pretty strict rhythm as to how and when they want to cast everything).
The damage increase of Balance is superior because it does 10% more damage flat out without speeding the consumption of resources.
I just really don't want anyone popping up and saying, "Wait, so this means AST is good after all and doesn't need buffs?! Yay!"