To do that better, first emit the particles facing the camera by using "Alignment-> forward Vector "Target" and drag the camera.
Then just set the Follow Rotation to 100.
https://www.dropbox.com/scl/fi/p32613ars2ml9iy7a0fgj/emit-RBD-facing-Camera-01A.c4d?rlkey=9x2sckuslfc5sbierupn51p3j&dl=0