Amy,
You are not alone. Some of the most powerful mentoring tools for individualing the instruction are the corrective, and confirming, feedback you provide via submitted assignments and assessments. Individualizing the responses that takes each student to 'their next level' of understanding requires more time and effort, but it is clearly an avenue of enhanced learning for each student as you master the art. You will also see an enhancement of the quality in individualized email and phone communications - and maybe a diminishment in the quantity.
