I use Round Trip as well. I'm mostly 3a with some 3b ... I have very fine hair.
When I use Round Trip, I use it as if it were CK. I find it does the same thing .... and no itchies! The glyercin in CK makes me itchy if I use it too often. I use Round Trip after leave-in and before my other styling products.
When I use RT, I don't normally use a creme curl enhancer, just gel (after RT). The RT is a big curl enhancer, so I only need the gel for hold.
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 !!!