While the SE 2016 game release fixed some issues about objects LOD... some are indeed still there.
I spent a lot of time inspecting the whole game data related to objects LOD and I released a complete ressource pack on nexus:
https://www.nexusmods.com/skyrimspecialedition/mods/177210
There are many screenshots there and I won't mirror them here.
Basically, all that the final player really needs is the 5 optional fixed archive files that I uploaded on nexus. I allow permission to include them in USSEP.
Please note that
issue 36430 that I posted a few days ago is redundant with the files I uploaded on nexus.