Also, I finally got it working now!
@Greame Champion
1. Uninstalled AC and CM entirely (deleted also all the folders inside User\Documents\Assetto Corsa and User\AppData\AcTools Content Manager).
2. Installed all the Visual C++ Runtimes (it needs only the 2015 for the shaders patch work, but why not
install every version at once?). Installed also the
.NET Framework 3.5.
3. Installed AC again, started it with the original launcher, played a little. (To install all the missing things and create the Assetto Corsa folder into Documents).
4. Installed CM and all the plugins.
5. Installed all the mods into Assetto Corsa\mods folder and activated at the following order: 1st Custom Shaders (0.1.25-preview129), 2nd Sol (1.2), 3rd Wet Mod and TK's Smoke Mod at last.
6. Installed all the Tracks VAO and Tracks Config (Settings/Custom Shaders Patch at CM).
7. Tested with a Wet Track and Rain weather. It works!
After that, I edited the json file to change the description (I have also the OSRW mods) and i got the weird mud spray back. Deleted the mod, installed the zip files again and it worked.