i'm 5.5 months post hair dye. I'm also trying to NOT use heat. My dyed parts are frizzy 4b, when my roots have a defined curl pattern. I didn't even know there was difference with my virgin roots and ends until I started the CG method and my hair began reaching it's curl potential. I feel love playing with my roots 'cause it feels so soft and moisturized. My dyed hair doesn't feel "bad" cause I take care of my hair, but I feel the difference in my hair. I don't know if diffuser causes damage hair 'cause in the winter, I might be using that.
***edit*** I use sulfate free shampoo again and don't use shea butter