CFI training
I second the suggestion about using the same syllabus your instructor used with you.
Keep hitting the FOI hard. Keep up the reversed roles. Your instructor student should conduct a lesson the standard, professional way, beginning with a preflight briefing, the flight, and a postflight critique. During the preflight briefing, you can feign disinterest, boredom and stupidity, the same as real students do, but you should also offer pointers to improve his presentation. Same for the post-flight, except that you will be critiquing his presentation in flight and his correction of your "errors."
If your trainee is having trouble preparing a lesson, tell him that a good flight lesson is something like a good speech. A good speech begins with an introduction as to what your speech will be about, then the body of the speech, with it concluding by you telling the audience what you just spoke about. In other words, the preflight briefing sets forth what you will be doing today, the flight is actually doing it, and the post-flight is reiterating what you just did.
(By the way, it won't hurt you to fly the maneuvers to the best of your ability. You may find that you aren't flying them as well as you think you are - and you will likely get some quality flight instruction out of the deal!)
You do want to have your trainee prepare lectures on non-flying topics. You do have to provide training in classroom instructing techniques.
Don't forget to emphasize that lesson plans should be prepared using the precise format set forth in the FOI. Finally, emphasize heavily to your student to never stop teaching. Going silent during the practical could lead to a pink slip.
Good luck with your CFI students.