They're really not scaled at all. An overall increase in difficult for hunts is needed if they were to work properly, at least on high population servers, since I can't really say how the're currently doing on low pop servers. The time window between finding the mob and pulling it is already small, and the fact that they're burned quickly doesn't help that the hunts are only helpful to a lucky minority which happens to stumble on the mob or to be close. I surely hope for a fix soon, for hunts to be a viable option again.