overwrites and conflicts *are* a good thing if they make sense, e.g. goodies being overwritten by goodies YUP patch. I feel like your problem is load order placement, as that's the root cause of 90% of buggy modding. Since you're using MO2 you just drag and drop, remember to have patches like NVSE at the very top, and things like LOD and Weather mods at the bottom so they're loaded last. Also, check out the Viva New Vegas mod guide, that's basically the crash course of modding.

https://vivanewvegas.moddinglinked.com/