Teacher-talk is more than questioning. Teacher shouldn't talk for too long ,of course, but they shouldn't be afraid of teaching.
Differentiation can be achieved by teacher language. When you know what your key moments are - the golden moment of explicit explanation, the confirmation of ideas, the rich transition content - hoe are you using language to present a range of access to your thoughts? You can plan two or three ways of describing to key points, but can we be more systematic than that? For example, are you using figurative language?