With circles and spheres. I have noticed that is good to calculate the right "lenght" for the base to flow, following the diameter of the sphere or the circle.

For, Pi = 3,141593;
P (perimeter; or C, circumference) = 2 Pi R;
R = P / 2Pi = P / 6,2831;
P = Pi D (3,141593 x D);

Example: for 10 in diameter; P = Pi D = 3,1415 x 10 = 31,415, so the length of base to flow = 31, 415.

I believe that can help sometimes.