After many hours of testing and reading info for dyndolod etc. and re running all of it i was able to iron out (almost) the issue of this problem, it has nothing to do with snowgrass02, or other vanilla grasses, the culprit is one of the greentreedrj21 files of the Freaks Floral Fields mod itself, by disabling (deleting) all of the instances of greentreedrj21 in TexGen(depends on your install.)\textures\terrain\lodgen\freak's floral fields.esp you will already achieve a way superior lod result, with none of the issues mentioned above with the "snowy" grass!
This issue will appear in other locations as well not only the tundra biome!
But not all of the greentreedrj21 files cause this issue, i will make another post when i discover the specific file that causes this!
Thank you again sheson for help and the amazing tools that you have provided, after reading more of the documentation provided i'm just amazed by the flexibility of these tools and the visuals achieved by it! THANK YOU!