This is me. Cones have always left a film on my hair and sulfate shampoos with the exception of Nexxus Moisture Therappe shampoo were always drying. I dont use cones period water soluble or otherwise. I've been modified CG (i use combs and castor oil) for over 2yrs now and my scalp and hair have never been happier. (I've BC twice)
But if cones work for your hair that is great. All of us have a unique DNA and noone can tell you what is best for you other than YOU.