There is no single way to do Intermittent Fasting. It sounds like you are trying to do more of a "Leangains" style IF, which is fine but note that it is geared more towards bodybuilders and those looking to bulk and lose fat simultaneously. If so then make note that he only recommends women do 14/10 and not 16/8.
The only way you'd break your fast with "too much" food is if it caused you to exceed your caloric needs for the day. There are some who practice "Warrior Diets" where their fast breaking meal may be all they eat for the entire day.