So, I really liked that bowling ball from a cube thing - it looks super nice!
but i did not see that profile: but there is a profile type.
I made an ok curve in the profile by putting a dot down in the middle and moving it to at .25 and .25
you should be able to get basic circles by using that
(I also made the thumb hole a bit larger by joining the vertices [select group of vertices, RMB, Merge Vertices > At Center] and using that center point to then bevel)
