Hmmm, I live in Atlanta and it’s not humid here too much in my opinion. I don’t experience shrinkage in the humidity as much as I do frizz. It’s actually the opposite for me, when I do a twist-out my hair is “bigger” and when I do a wash-and-go, my hair has more shrinkage and looks “smaller”. I would highly recommend you allow your hair to dry overnight completely before taking it out in the morning, especially since you live in a humid environment. What products are you using?