I didn't have DynDOLOD set up at the time and wanted to let xLODGen handle it, out of curiosity to see how it'd do.
No, I must've checked it on accident and forgot to uncheck it. Oops.
Appreciate the other advice too btw. I'm not especially tech savvy so I'm always open to it.
Having good results, no issues or complaints on Skyrim SE.
I've already posted my full settings and the above image on Nexus Mods, but I'll post them here too, to save people an off-site trip.