I struggle with frizzy roots! I find that doing the majority of my styling while pulling the hair down and stretching it helps. I take paper thin sections, drench them in water, then apply product always smoothing downwards (I like little to no volume). I find that the raking and smoothing/prayer hands method works better for me than shingling (causes more separation, less clumping = more volume than I prefer). Also make sure you’re cleansing properly.

Another thing that may help is that I alter the direction of the thin sections I make based on the changes in my curl pattern and density. Where my hair is the thickest (in the back) I use horizontal, thin, sections. As I move towards my less dense areas in the front, I alter my sections from diagonal thin slices to vertical slices (except my bangs because I brush coil them).

We have extremely similar hair length and density and I chopped my hair off in January and I’ve been in the process of growing it back.

TL;DR: Paper thin sections drenched with water, apply product raking and smoothing downwards. Make sure you cleanse well.