Thanks for the positive feedback. And sorry to hear about your results with that shampoo.
A more natural approach is likely best in this situation. My current regimen (My Seborrheic Dermatitis Skin Regimen 2.0) uses all natural fatty acids to control my facial seborrheic dermatitis and some people use it with great results on their scalp as well.
Personally, simply using this shampoo: Andalou Naturals Moisture Rich Shampoo, seemed to clear by scalp issues.
A medicated shampoo you may want to consider is this: Kertyol P.S.O.
It uses a supposedly more natural alternative to coal tar and is considered to have a better safety profile (and is much more popular in Europe).
Hope that helps and look forward to any updates.