"3. Intuitively, it sure seems like my inward awareness is causing my internal narrative to say certain things."

Intuitively maybe, but in the epiphenomenalism you only have conscious experience of the 'inward awareness', and it is in reality a physical function which creates the experience, so the experience does not cause anything.

"4. The word "consciousness", if it has any meaning at all, refers to that-which-is or that-which-causes or that-which-makes-me-think-I-have inward awareness." Your not using the correct definition for the zombie argument, therefore your point is invalid. Consciousness means in this context the sum of sensory experience.