I suggest to shoot a full sphere when you want to display a full sphere! Your panos are heavily distorted because you didn´t use 2:1 equirectangular images for building the spherical panorama.
Also i suggest to get rid of the heavy chromatic abberations which produce the violet edges which become very visible because of the too deep zooming in the transitions. Use: "limit zoom to image resolution".
If you want something you´ve never had, then you´ve got to do something you´ve never done.