I don't know what products are available to you, but a few general ideas that might help:

Have you figured out your hair's properties (texture, porosity, etc)? These make a huge difference in finding the right products.

Make sure that when you co-wash you're massaging your scalp very well (I usually do a good 2-3 minutes). And continue to massage scalp as you rinse.

You might want to try rotating in a sulfate-free shampoo (low-poo). There are lots of people who cannot co-wash exclusively, especially if your hair is fine in texture.

Have you tried baking soda or an apple cider vinegar rinse?

I hope this helps a bit.

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3a/f/iii
Modified CG since 11/5/11
CLEANSE: CJ Daily Fix, DevaCare No-Poo, CHS Treatment Shampoo
RO: SS Caitlin's Conditioner, CJ Beauticurls Strengthening
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier,Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel