Hi Jose, thanks for solving the issue! I tried it and it worked as desired. 
Unfortunately I have now encountered a new problem (sorry!)
I applied the cloth proxy and it does not work for the "small" particles.
In these 2 videos, the problem can be seen with the green particles. The red particles are working correctly.
1. https://www.youtube.com/watch?v=7Yh8mMR1oYI
- settings: the small green particles are not pinned, the rest of the green particles are.
- results: the cloth proxy does not move.
2. https://www.youtube.com/watch?v=unXX_i5mkSw
- settings: only the largest green particles at the edge of the mesh are pinned
- results: the cloth proxy moves. however if you look closely, the cloth proxy part associated with the small particles does not move with the small particles. The cloth proxy is actually following the movement of the larger particles.
Unfortunately I have now encountered a new problem (sorry!)
I applied the cloth proxy and it does not work for the "small" particles.
In these 2 videos, the problem can be seen with the green particles. The red particles are working correctly.
1. https://www.youtube.com/watch?v=7Yh8mMR1oYI
- settings: the small green particles are not pinned, the rest of the green particles are.
- results: the cloth proxy does not move.
2. https://www.youtube.com/watch?v=unXX_i5mkSw
- settings: only the largest green particles at the edge of the mesh are pinned
- results: the cloth proxy moves. however if you look closely, the cloth proxy part associated with the small particles does not move with the small particles. The cloth proxy is actually following the movement of the larger particles.