I cant seem to find a download anywhere for the UV corrected tree meshes, do you happen to have the link?
I assume this is for use with your bitter coast mod?
I don't have a link, it has probably been pruned from the forums by now. But I can upload it if it can't be found anywhere else.
The suggestion was for the Ascadian Isles trees, as I don't recommend using any of the billboarded tree meshes found in those mods. They were some of the first models/trees I made, all I did was add some billboard planes onto the vanilla trunks, and slapped on the nearest texture and included them in the mod. They were made before infinite view distance/mge was around so they were never really suited for that. For me they ended up being a fun experiment of trying to recreate Oblivion's speedtree effect, but ultimately nothing I would keep as a permanent tree replacer in my game.
Feel free to use them if you like them, they work okay besides the issue mentioned in the OP, I just personally think they look like crap, not even Oblivion got the billboard thing right which is probably why they're not using speedtree in TESV.