Balance and Timing
I totally understand what you mean by this because I work at Pf Changs. They always talk about creating a balanced meal for the guest in order for them to receive the ultimate dining experience. The balance and the timing of the meal ensure the guest are happy with their meal. Much like how rhetoric should be used in any given situation. It is not only about the language you use in a situation but when and how you say it. These two together helps get your point across and could possible persuade someone.