From levels 12 to 49 you need to take a close look at mana cost for your DoT's, the damage they do, the speed you can cast spells, the duration of the fight, and that breaking point where you back the pet off at the last 15-18% of health so the DoT's do the ending damage (or as close to it as possible).
It takes a lot of experimentation and it's worth taking the trouble to do so. Once you have a general feel of the absolute necessary spell damage required to get full exp while at the same time casting as few Fears as possible, you begin to get into the groove of efficiency.
Whenever I would crest into a new line of DoT spells, very often I found myself not using them but instead relying on my older DoT spells depending on my target mob's health. You probably already know this, but try to get a Kromzek Spyglass as quickly as possible as a clickie item to reset spell gem recovery for the fastest chain casting of spells. I think at your level I was content to kill 4 mobs total before going into a mana recovery break.
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