I usually go by how I feel. Sometimes I’m good fasting my normal schedule and sometimes I get huge cravings and need to break it early. I just give myself a lot of grace during that week before. I also try not to weigh myself much during that time because I tend to hold more water weight and it can be mentally annoying.
I’ve only had repercussions when I’ve been extended fasting leading up to my period. I do get PMS cravings, and find I’m happier if I integrate some of the cravings into an IF window. I’ve read that eating a couple of dates can be sufficient, but that’s not satisfying for me 😆
I kept my 18:6 schedule and it has prooven to be better for me than reducing fasting window. That will only make it easier to give in for temptations, but then again everyone has a different way and maybe what works for me doesnt for others! Experiment and try, you will find the best formula for you!