I would think Castor oil is too thick & sticky, MCT much better but there are other alternatives like Olive & Shea Esters. Lexfeel natural will give a good sensorial. Are you using a humectant?
I have actually tried MCT oil as well. It works quite well, although still with some tackiness. Lexfeel looks interesting and I’ve requested a sample. I don’t have a humectant in the formula at present, do you have any suggestions?