I know how frustrating this can be! I have 3b/c curls on the top layer, and 2c/3a curls on the bottom layer! It's hard sometimes. But I find that protein and deep treatments work really well, especially when I do them consistently.
Curly and PROUD!!!

My hair has a mix of low/med/high porosity, and it's medium textured (some are still fine, though!)

CG since Sept. 2011
Cowash: Vo5/Suave Naturals/Tresemme Naturals*
RO/LI: GVPCB*, Tresemme Naturals*
Low-poo: Shea Moisture Moisture Retention
Stylers: KCKT*, Coconut Oil, Olive Oil, Grapeseed Oil, Honey*

* represents my HGs!!! Finally!!!