I have better luck with Jessicurls sulfate free shampoos over Deva Low Poo. I prefer Hair Cleansing Cream which is the gentler of the 2. The other is Gentle Lather Shampoo.

Low Poo left my hair feeling kind of filmy like it had a residue also. HCC does not do that, just leaves my hair feeling clean.
2b/3a, primarily use Jessicurl and DevaCurl products, Curls Hair Tea conditioner and various gels. I'm modified CG-ish since 5/04.