When I am doing a speech. The way I focus on both feelings and logic is by making sure that with my logic, that I feel the same way about the facts that I am mentioning. I will make sure that I mention how I feel and my opinion on the topic. There needs to be a balance between the two. I know that I've crossed a line if I start showing emotions about the topic, or if I'm just stating facts and not saying anything else about the facts that I am saying.
That is a great idea, that by knowing what you feel about your facts helps you balance the two.