Christina, your comment about pretending to have a conversation rather than delivering a presentation reminds me of advice from one of our SCoPE seminar facilitators, Jesai Jayhmes. During a 2-part seminar called "Humanizing the Online Experience" Jesai led us through a process of learning to speak to the camera. He brought a background in voice coaching and acting, and many of those techniques apply for sure. Have you ever watched an actor on stage and felt like you were the only one in the audience?
Nice strategy! It works!