I think it may depend on what PT you use. I use moisturizing PTs like CJ Repair Me and SS Protein Repair.

You hair sounds similar to mine--fine, low porosity, highlighted and I started out as a winter wavy/summer 3a. It was coming onto nc.com and learning how to take care of my hair that made it what it is today. Most important thing is to read and learn.
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08

SE PA

HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic (now Hello Curly Curl Stimulater); Botanical Spirits Jellies, CJ Repair Me, Marie Dean Leave Ins and Curl Creams