He added some additional configs in 1.4.1 to help combat that problem if it happened. I'll see if they work when I roll out a hotfix when I get out of work. They work on a mob by mob basis, so I'll have to play with the numbers a bit to reduce the overspawning.
Thanks a bunch Eyamaz. I appreciate the time you take putting this together and working out the kinks. Can't wait, you rock! People were also posting the same problem in Magicfarm beta thread.