jonusl2d

SKSE version requires the mem block one to be 512 minimun as 256kb of it is used for something else so to get 512 you need 768.

While in the CK there is a particle shader for the rain that allows you to edit various things, such as density of the particles in the effect box, the size of the effect box, as well as the ability to stretch the texture to be longer or wider or both. I suggest playing with those parameters to see if there is something specific your looking for.