Giovanni TTTT low poo will help with the itching, but I never use it more than once a week. A dab of straight tea tree oil will help too. I can only use a tiny bit, because my hair is fine (even though it's crazy thick). Also, how are you massaging your scalp when rinsing out your products? That makes a HUGE difference for me.
-3a/3b, fine, very thick, normal por., normal elast., long, dye- free (CG since Nov. '11)
-CO: every other night (air dry) VO5 (various scents)
-Low poo (1 or 2 times a week as needed): ION Color Defense Clarifying or Giovanni TTTT
-RO: GVP CB
-LI: Giovanni DLI or a tiny bit of VO5 (my co wash)
-Styling: BYZ Noodle Head Tame your Curls Mousse
-PT: ION Effective Care