Hey Taz,
Just reporting that there seems to be an issue in the latest V5 version for open beta. at some distance the trees LOD have the bilboard shadow on the wrong side.
Here is an example with all mods off, just you medium trees V5 enabled.
Here is an example with CGTC V2.0 terrain mod and Mustangs shaders mod enabled
and here are my settings
I hope you can look into that