How can I duplicate a PCG Volume & Spline Bound

I have tried to create a PCG set up that limits the generated points to inside a closed spline. To try and get more organic distributions. It works, but only for a single PCG volume and spline actor. Multiple splines within one volume do not work. Multiple volumes with their own spline do not work.
I have made sure the actor tag references for the spline and Get Spline Data match. I have ticked Select Multiple in the actor selector settings. But it just cannot seem to handle multiple placements of the same PCG Graph/spline actors.
Any insights would be really appreciated.