@zoar: you don't need more wizard levels, that's for sure!
...Use a red gem+amplifiers from now untill...third or fourth epic, I would think think. Set monsters to armored only in the battle setttings, because that will guarantee no evil swarm waves.
Anger any wave with at least 11 mana gain/kill with at least one grade 1. Do not over anger!
...I did not use exactly airdecade's setup, but it was very similar.
On a related note, I hate swarms.