CG for a month, now I have buildup and flat hair?

CG was going great until this past week or so. My hair had been looking the same as before, but I thought it would get better as time went on. Now my hair is feeling flat, not curling like normal, and feels dry. (maybe it has to do with frequent swimming in the ocean and pools?)

I have 2C/3A hair When I started CG I washed with a sulfate shampoo for the last time to clarify/cleanse, then started this routine: Cowash- Suave Naturals Coconut. Rinse Out - VO5 Herbal Escapes Pomegranate Bliss. I comb my hair out in the shower with a brush made for wet hair. Put my hair in a tshirt to dry while I get dressed, then I "fluff" it out (shaking my hair out kinda?). Sleep on it wet overnight and normally wake up with great curls, until now. :(

I'm thinking about going low-poo with maybe Tresemme or Not Your Mother's. Any help or product recs are appreciated :)