(Niagara) add collision to a mesh renderer while scaling the size?

I made this niagara VFX using a mesh renderer. It’s a simple sphere with a material that expands through the entire map. I’m quite happy with how it looks.

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Problem happens that I want the mesh to collide with the player and call a function from the blueprint that spawns this Niagara System. Calling the function isn’t the problem, but the collision of the System is. See next gif:

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The blue line is the radius of the mesh collision and respects well the size of the mesh, but only that line can collide with the player. That means that doesn’t matter if the sphere touched the player. Unless the player touchs the line coming from the center to above, the collision won’t register.