X-Particles' xpCover modifier stick to modeling like magnet... Please help me


I have tried it in this scene with the xpCover modifier after using the xpSplineFlow. After following the spline, I judged that the only way that the particles stick to the modeling is xpCover. However, the current particles are not natural and seem to stick together like magnets.

Also, it’s so unnatural when the particles fall out from the process of modeling. I used xpSpeed to solve this problem, but it didn’t work. As another way, I used xpFlock, but it also seemed unnatural.
With this problem, I want to reform it. I wonder the way that I can make particles stick to modeling naturally. Could you give me any advice? If I get some, I think it can be improved.