Can you clarify what an eating window means. Is it five hours between meals or only five hours a day when you can eat?
If i was in your shoes and wanted to follow an IF, i would would follow what you know works during the week and on weekends, eat breakfast lunch and dinner at more normal hours but don't eat between meals and especially don't eat after dinner at night.
When you do these eating windows, are you eating whatever you want when you want or are you eating proper meals.
I find i don't get hungry if i eat proper meals and time my meals so that i am ready to eat about the time i'm due to get hungry. So it only means i get hungry at night but then not very much so because my calorie restriction isn't extreme. I hope this makes sense.