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.
2b/c, high density
fine, medium porosity, normal elasticity
loves protein, hates polyquats
still searching for HGs