It could simply be too much protein for your hair. Does your hair feel straw like and stiff? When I do IAgirl's gelatin PT, I leave it in my hair for about 5-6 minutes and then leave in my deep treatment for about a half hour. Perhaps if you're using the protein-rich conditioner daily, the 15 minute PT was just too much?
Also, I think the HE hello hydration has dimethicone in it. Which isn't a problem if you're using the GF pure clean shampoo regularly, since it has ammonium lauryl sulfate.
2c, medium to high density
fine, medium porosity, normal elasticity
loves protein, hates polyquats
still searching for HGs