I found the CV soaps were too harsh for my hair. A really mild, safe (according to EWG) shampoo is Curl Defining by Salon Naturals
. They'll even make it without extracts if you have allergies. It doesn't suds up much, and I use it every few weeks with no problems. The shampoo bars made my hair squeaky and dry. I guess they work better for others.
edit: I saw the shampoo you listed had potassium sorbate and fragrance. Salon Naturals also has potassium sorbate, which is an OK preservative. Anything labeled "fragrance" is undisclosed and unregulated. I try to avoid those. Have you tried the EWG
site for checking out cosmetics?