Oil concerns

On this and other boards. A lot of you all mix oils in conditoner and other products to acheive soft hair. My question is have any of you have success with growth and moisture with them by themselves or mixed together? If so which ones? I have tried a Jojoba oil, Olive oil and shea butter mixed together and it made my hair dry. Then I tried Castor oil mixed with coconut oil and it made my hair moist and soft. I really wanted the First mix to work out because I like the sound of it. I have tried Carrot oil, grapeseed oil and vitamin e and nothing special happened with my hair. I use the different oil combos  daily. I tried to use them (it did not matter which combination) after a wash and my hair was brillo pad hard all the time. I even used a  moisturizing creamy leave in before I used the oils and still brillo pad hair. Am I doing something wrong or is the quality of the oils canceling out the benefits of each other when I mix them? What can I do? I do not want to use grease or spray sheen because it weighs my hair down and things like s-curl mango butter and stay so fro gives my hair a gummy text. I am 4a/b natural.