Interior missing textures for me is fixed by increasing the interior cell count in the ini. I use 8. The line is missing in most inis. It goes in the same section as the exterior count line.
There is a fix for the molerat, bloodworm,radscorpion crash/hang bug, if that's what you mean by surging. Seach for "topside" on the nexus and read the comments about what the bug is.
I don't worry about the scrapping stuff. I also use ugrids=9 and a mod that deletes previs. Doing so does reduce fps by a lot, but only in areas with heavy rebuilding. LODs can screw up tho if the mod doesn't load corrected ones. On a newer cpu/gpu scrapping shouldn't be a problem. For the curious, there is a mod on nexus that deletes all junk and scrap from Boston. Many buildings actually sit on piles of junk, which when removed allows you to walk under them. Why BGS didn't make the world flat with buildings sitting flat on the terrain with no gaps was a mistake imo.