How to make smooth surface

[3dprintinguser]

Hello, I am using a Stratasys uPrint SE Plus 3D printer. I tried to make a smooth curved surface but in both trials, I failed. The one on the left had support at the bottom (curved surface at the top during printing) while the one on the right in the photo (the shorter one due to earlier termination) was made upside down. That is, the curved surface was touching the support material. Is there any way to make the curved surface smooth? Is there a way to remove the strange lines. Stratasys mentioned that the pitch resolution is 0.254mm and as a result, there is not improvement in making the surface smooth. Do you guys have a way to make the surface smooth? Any way to remove the strange vertical lines? Also, Stratasys mentioned that the verticle lines were made due to starting and ending points. Any way to fix this issue? Thanks.