Creating a package of particles targeting low values of porosity

Hi dear Yade community, I’m trying to generate a cohesive granular packing (representing a mortar joint) inside a bounded box with a target porosity between 16 % and 28 %, using a polydisperse particle size distribution. I’ve tried pack.SpherePack.makeCloud(), but the resulting packing is always very loose. I have tried also to place the particle manually using configurations as the close-packing of equal but still is missing to reach such a low porosities. I also thought about using clumps to generate figures to reduce the voids, however is not a trivial problem in the 3D space if someone have any suggestion in this will be very helpful.

Best regards

Johnatan