I've yet to see any AM ever get cast. Even with just a Ninja and a Monk meleeing, you should be able to interrupt half of the ga spells. And I'm pretty sure avoiding the qutrubs to start is a good idea. Chances are you'll get magic from the first lamia or two, making the fights much much easier. I'm not sure of the drop rates on the draugars compared to the qutrubs, but they die at least twice as fast.