I'm not knowledgeable about bromine but your pH is too high. You need to bring it down to the mid 7's. If bromine is anything like chlorine, it's gets far more effective at lower pH levels. Also I have NO idea if you use Cyanuric Acid with bromine and how much. But it sounds like you desperately need to shock the pool. I don't know what will happen if you use chlorine, either.