For smoothness it will probably help if you give the blend a bit wider space to work with, and also slice off a larger portion of the ellipsoid so that you don't have so much of it curving inwards which will then make the blend continue to curve inwards as well.

I've attached a smooth version here, if you export to a mesh format such as .obj and use the following settings you can see that it's very smooth, dense meshing settings like this will get rid of the display artifacts that you were worried about earlier:



- Michael