I have finished the reseeding phase - plan F, but still have what feels like mucus in the back of my throat. I cannot seem to get it to drain or go away. Is this a sign of ongoing yeast/fungus? What do you suggest?

Yes, it's a sign of ongoing pathogen elimination as the body is wrapping up pathogens in mucous to transport them out. I'd use clay/earth as stipulated in the candida protocol for a short while like 3 weeks at 1/4 clay and 1/2 earth. Consider ordering Biocidin throat spray for the throat microbiome.