Have you tried Kinky Curly products? I have fine (but a lot of it) 3a/3b hair. See picture. I co-washed with Desert Essence and then Knot Today and Kinky curly gel.
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Shea Moisture Curl Enhancing Smoothie-myhair_2011.jpg  
Cate
3a / 3b? CG
Wash - Deva No Poo, Desert Essence
Co-wash - One Condition, Trader Joe's Nourish Spa Balanced Moisturizer, Desert Essence
Leave In - Kinky Curly Knot Today
Style - Deva Angel, Kinky Curly Curling Custard