Particles question: How to stop them from 'rolling'

I have a specific request as to how to prevent particles from ‘rolling’ when they hit the planar-region. Right now I’ve got the confetti example and have tweaked a few things, but can’t figure out for the life of me what it is I need to alter to stop them from moving when they hit the ground.

I’d also like the confetti to ‘float’ a bit more. Again, when I changed the things I thought that would affect it, (gravity and weight of particle settings) it seemed to be too sensitive or do nothing at all! Quite a hard one to figure out so far.

I’ve uploaded a video of the result I’m currently getting and the zipped TB file (made in H21).


Thank you in advance for anyone who can assist!