I have had a couple of inquiries of why their creams recipe was "sandy" or "gritty" feeling. And what it really boils down to is that if you add too much of stearic acid it will make your creams feel that way.
So try to be as accurate as you can when you measuring out your stearic acid for your creams recipe and make sure that it is completely melted before mixing.
Included in your handout there is some information about this. If you would like additional information here is a link about stearic acid -http://www.botanical.com/products/learn/stearic.html