Yes, I think you are right. When re-reading the POH carefully and interpreting what it says, it seems you are supposed to start the leaning procedure from "the full rich or maximum RPM mixture", and there is no mentioning of touching the throttle except that "any change in altitude or throttle position will require that peak EGT be redetermined and the mixture be reset".
So I suppose this must be the procedure then:
- Low altitude: Start at full rich, set desired RPM from power setting table, then lean to peak EGT or 50 rich of peak without touching the throttle.
- High altitude: Start at "maximum RPM mixture" (which I take to mean the mixture you used just before TOC), set desired RPM from power setting table, then lean to peak EGT or 50 rich of peak without touching the throttle.
Thanks for getting me sorted on this!