P_Cloud particles system [from EPIC content examples project] - How to use with Static mesh?

Hi,

just migrated in the P_Cloud particles system from the content examples project and trying to figure out how to have it interact in a convincing manner with a static mesh.
As per the included short video I get a very undesirable and visible banding artefact.

I attach screengrabs of the meshes collision [MC images]and of the actor collision I added to the default P-cloud i imported.

I have no experience with particle systems and was naive enough to think I could bring it in and it would work ‘straight out of the box’:wink:

What do I need to do to get this to work?

any help would be appreciated,

anyone?
many thanks