I found what I was reading and it was a review on Elucence Clarifying shampoo on Curlmart's website. The person said that she had developed a scalp issue which was from calcium carbonate in her water and that the shampoo cleared it up. I noticed that most of the shampoos you listed have a lot of ingredients and are full of fragrance. It might be good to try something that's for sensitive skin/scalps like Kenra's sulfate free shampoo or even something by Giovanni, also something without tea tree oil or tea tree as the base of the shampoo. Tea tree can be irritating to some. If all of that fails, there's a shampoo by Mustella that's sold at Target and Babies R Us that's for babies with eczema--you might try that. I would start with a visit to a dermatologist though so that you aren't adding a bunch of stuff to your scalp that might irritate it further.