I may be over simplifying this, but just in case ....
I often had a frizzy strip down the middle of my head. I thought I was applying my products evenly, but I wasn't. I always make sure I apply it with my head tipped over but then lift my head up and rank some in the middle back of my head. I do this with conditioners and stylers.
Type: 3a fine & dense,with normal porosity, terrible product junkie
ROUTINE: LI, enhancer, gel, plop with Curlease towel, serum product (either CIAB or Gel-les'c), clip & diffuse.
Too many favourite products to list ... I finally have my routine that works and alot of products to choose from. My product stash is huge, but well loved !!!