If you have hard water, real soaps like CP and HP will react with the minerals in the water and create deposits that stay on the skin which are very drying. I have extremely hard water and I find that there is a balance between using enough CO to get good sudsing (hard water also reduces the amount of suds you get), but not too much to be drying and also and having a high enough sf to keep my skin from getting dry. If you don't know whether you have hard water or not, this is an easy way to tell: When you are rinsing off the soap, does your skin feel slippery or more squeaky-clean? Slippery is soft water, squeaky is hard water.