MJ you said 80% of your students were solo in 3 hours.
In that time you managed to patter attitude for airspeed, disregard it due to the student and then patter PnP.
In 3 hours, really?
Seems a bit like you pattered both at the same time to me. For example I've got a student who wants to hear the patter for the climbing lesson twice before we move on. That's about an hour and a half of flying 7.1 and 7.2. If I was suddenly to change the sequence wouldn't it seem to them I was pattering two different methods side by side?
Anyway, yes if PnP wasn't working with a student I would change the technique that I was using to teach the approach. However I couldn't see myself doing it inside three hours unless the student just looked completely baffled throughout the whole circuit lesson.