I have used the 0, 3, 6 and 8 for about 2 years and it's really helped my dry, brittle hair. About 2 months ago I added the 4&5 and now Instead of my hair looking smooth and silky, it's like straw. It also makes my scalp feel a bit dry. Has anyone else been unimpressed with the shampoo and conditioner? What shampoo and conditioner should I replace it with to try re-hydrate it again. I'm really disappointed as before using these 2 my hair looked the best it's looked in years.