mav80

Since you know what you do in the CK, there is not much left to check. Is it normalized? Stuff like compression and equalizing can modify the perceived loudness without altering the peak height. But those would make the file allways be less or more loud, not only in the game. Some files can have embedded metadata, so maybe check for attenuation or weird channel settings in those.

I doubt the mod works in any way. The download only contains a .bat file with some dubious delete commands. Like this: del "C:\Program Files (x86)\Steam\SteamApps\common\Skyrim\Data\EGrass02short.dds" /s del "C:\Program Files (x86)\Steam\SteamApps\common\Skyrim\Data\EGrass02short.nif" /s So it attempts to delete some of your grass meshes and textures, but forgets to use the correct folders.