Texture and porosity are going to impact product selection- curl pattern is really not that important (my hair twin has 2b waves and I'm a 3a). In general, fine hair and higher porosity hair both benefit from protein. My hair is fine with normal porosity and it cannot get enough protein.
It does sound like you would also benefit from lots of moisture. I have the Deva products in rotation and also find that they don't have the level of slip I would prefer. My ideal conditioner would have lots of protein, lots of moisturizing, and lots of slip. I can get one or two of these at a time, but haven't found all three in one.
My favorites for slip are Tresemme Naturals (light on protein), Mill Creek Botanicals Keratin (light on moisturizing), TIGI Moisture Maniac (light on protein), Curl Junkie Beauticurls Strengthening (light on moisturizing).
Also, if you haven't already, check out the "Share Your Hair Biography" in the 2s forum to locate people with similar hair properties and see what works for them. There's also a thread in that forum for a great homemade PT.
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3a/f/iii Before the chop- Donated to Locks of Love, January 2013
Modified CG since 11/5/11
CO-WASH: VO5 Vanilla Mint Tea Clarifying, DevaCare No-Poo
CLARIFY: CHS Treatment Shampoo (used prior to PT/DT)
RO: DevaCare One Condition, Regis Olive Oil
LI: Cure Care, As I Am Leave-In
STYLE: Re:Coil, Curl Keeper, Biotera Gel, Deva Ultra Defining Gel, GVP Liquid Sculpting Gel, Curls Rock Amplifier and Strong Hold Mousse
PT/DT: IAGirl's PT, One n' Only Argan Hydrating Mask