Your story is actually not uncommon. I've read a ton of women don't do well with Deva products (me included). It sounds like you may have a protein sensitivity - that is usually a cause of dryness. If your hair shaft is corse (thick) I would avoid it. Also - do you use any oils? I use a glob of coconut oil on my very ends everyday and this keeps them defined and very moisturized.

HTH
Big Chop from hip - 5/2014
Enjoying the journey to APL or BSL!