Alright, I won't quote all that, because that's a lot of text there. But as for the SMX situation, I failed to mention it was within the launcher I had this problem. It seemed to happen when I did a random combination of poking through the mods on the launcher and trying to create a my mods. What I mean by the description was stuck, is that whatever mod I clicked on, SMX's description popped up for each. Not a big problem if you already know each mod, but it was cumbersome for me.
I wasn't using advanced mode because the directory I have it on doesn't have all that room. I can move it though. But how does advanced mode work in running multiple mods? Does it load each new copy with its mod simultaneously, or will it just be a single mod per loadup? Just curious.
I tried both Valmod expansion and overhaul and got the same errors at loading the particles on 7DTD. I could never run the game through the launcher, and then I went back to check on my directory, and it was full of extra folders and junk (from me using simple mode, I know), so I figured starting it as normal wouldn't work either. Verifying and moving my installation now and going to run SMX or Valmod cold turkey to test. Theoretically, if they're up to date, it should work.
Other than that, just a little extra detail on how one goes about adding files from their drive (rather than a link) to a My Mods folder/pack in the launcher. And a bit more detail on packs themselves. Thanks for the help so far.