You have to keep in mind that while a storm gust is present, other storm gusts will have no effect if casted on the same cells. If you cast only Storm Gust it will be a waste of effort.
What you need to do is casting Meteor storm and, with precise intervals, Storm Gust. You can use Mystical Amplification between Meteor Storm and Storm Gust in order to boost damage from both, but everything depends on the cast time of your character. High DEX (145+) Wizards tend to have higher DPS if Mystical Amplification is not used at all - as it has a fixed cast time and motion delay, time spent without casting any skill - it depends on your server setup.
Anyway, while magic deals ton of damage, the professor weakest point is acid demo.