no I think 3 hunters is the most effective. Sure, unrest will often creep up, but it is a self-balancing system, as failing to find slaves will allow the natural 0% taxation unrest reduction to operate.
think of it this way - If your unrest stays at 0, you're being inefficient... [well, 0% itself would be efficient]
This is part of why, say, 4000 pop is almost as good as 5000. Sure, you get a few misses, but that keeps unrest down, so it is almost as productive as 5000 pop. [i'd need the precise numbers for unrest generation to determine how low your pop can be and still be equally productive on average as 5000]
basically, 0% taxation yields a certain number of potential bloodslaves (without patrolling, which is a true killer), and you don't want to miss a drop of that sweet sweet sugar...
