For dome shapes rail revolve can be better, although you will give up some of the control over the sloping of the sides. But to use rail revolve, you'd select this for the profile curve:



Then run Construct > Revolve > Rail revolve, then pick the bottom closed ellipse as the rail, and then pick the revolve axis here:





That will make the pole where the surface pinches together to a single point to be at the top and to have nice shaping there.

- Michael