Charity,
This sounds like a good mix of instructor-led media along with PPT back-up. I use PPT to guide me through the main points of a lesson. I avoid trying to put all the material on slides (there are better ways to give students writtem material to read). For me, PPT is just an extension of the white board, which I rely on as extension of my thoughts and the lesson points. I'll go to dark to break up my presentation for a discussion, a demonstration, or another activity, then return to the slides, repeating this throughout the lesson. Variety helps keep students focus and attention.
Barry Westling