"Socrates" vase

Just playing with geometries and finding out what my printer can and can't do... also playing with some low-relief on the side of the vase.
Note the line on the side of the low-relief that resembles a stich line... I have no idea how to get rid of that. I used standard resolution (0.20 mm). If somebody has ran into a similar problem and solved it, I would appreciate any advice.