5 Weeks...5lbs?

I've been doing 16:8 every day, very strict for five weeks. I know you're probably thinking "well then eat a little less, tubby!"--- and that was hurtful. Jokes aside, I'm of average weight (180lbs/5'9), athletic build.

I'm eating pretty wisely and believe this must be due to an issue with portion control. My question is, is it better to reduce portions or just extend my fast to 18:6 or something along those lines? I eat lots of lean proteins and salads primarily and am pretty in tune with what I'm eating. I thought the fasting would make it so that I didn't have to worry significantly about my meals but...well, here I am. Anyway, help!