help with voronoi on a cylinder

ok I've compiled a definition that will create a voronoi diagram and then flow it across a surface. It works fine when I use a planar surface for the initial surface input. I need to use a cylindrical surface though to cut down on distortion when I flow it to the final object. When I attempt to apply the cylinder as the surface though instead of the diagram that I would get on a planar surface i simply get vertical lines. can anybody help? I am enclosing both the definition and the project file.