G and I have said it a million times but it bears repeating for everyone following and doing this at home.
try to hold your fasted states as long as you can. not just after your big meal on the night of the 4/5day (typically you want to hit 24 hrs fasted w one workout in here) but after EVERY workout. hold your fast for hours if you can. you don't 'need' to eat here. there is no 'magic window'.
the longer you can hold these fasted states pre and post workout the better your fat loss will be.