Problem with particle collison

Hello Blender users,
I am still new on working with particle systems and I wanted to make a Text explode to many small parts. I seted all up correctly, I guess and added a plane the particles could collite with.
The animation works pretty well. But the particles should stay at the end at the plane like a hill.

Thats not the case. The parts are near to the ground but they have too much space between each other. Some of them are still in the air.

I hope you understand what I mean, and I wanted to include the file, but sadly it is way to big.

Would be very nice if somebody could help me

Have a good day

G√ľnter