Have you tried Giovanni Tea Tree Triple Treat Shampoo? It's a low-poo, and it really helps with itchy scalp and smells wonderful! This time of year my scalp can get really itchy!

Also, are you massaging your scalp enough when you co-wash? In the beginning, I wasn't doing it enough. Now I do, and I rarely have flakes, which amazes me!

Every once in awhile (usually every few months), I have to use a sulfate shampoo on my scalp. If it feels gunky and itchy, then that's what I do. Sometimes we just need that total clarifying that a sulfate shampoo gives. I go as long as I can without using it.

Good luck!
-3a/3b, fine, very thick, normal por., normal elast., long, dye- free (CG since Nov. '11)
-CO (As needed): Suave Nat. (usually strawberry) and air dry
-Low poo (As needed): Giovanni 50/50
-RO: GVP CB (experimenting with GVP The Detangler)
-LI: Giovanni DLI or a tiny bit of my co-wash or RO (sometimes none)
-Styling: BYZ Noodle Head Tame your Curls Mousse
-PT: ION Effective Care