I hates suave coconut as a co-wash. I always had oily roots as well and I do martial arts training for a couple hours a day so I was skeptical about the whole co-washing thing. I found that conditioner labeled as clarifying seemed to work best- my favorite is VO5 Vanilla Mint Tea. Make sure to massage your scalp well while cleansing and rinsing.
Cleansing conditioners are another option. They're designed to be gentle like conditioners, but they include ingredient designed for cleansing the scalp and roots (yes, regular conditioners have surfactants also, but in a regular conditioner surfactants are more incidental). I'm a huge fan of cleansing conditioners.
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