So i have tried to create at boundary surface that I want to be smooth all around. I cant seem to figure out how to place my guiding curves in order to get the desired result. I tried to do it in two ways. first pictures shows how i cant use direction 2 pierced to another direction 2 curve. second picture i get the right smoothness around my z axis but missing smoothness around the x axis in both tips of the shape. If any one have an idea how to add more curves or simply suggest to use another tool eg. surface loft feature (even it seems like it gives same issues),, please help me files wise does 2nd try belongs to first picture. 4th try belong to second picture.