Try one of these. This is my own from my own config and it doesn't draw close.
Code:
r_DetailNumLayers = 2
r_VegetationSpritesTexRes = 128
r_DynTexAtlasSpritesMaxSize = 32
r_TexAtlasSize = 2048
e_vegetation_bending = 2
e_vegetation_min_size=0
e_proc_vegetation=1
e_vegetation_use_terrain_color=1
e_vegetation_sprites_distance_custom_ratio_min = 1
e_vegetation_sprites_distance_ratio=1.5
e_cull_veg_activation = 60