Well I got the Kindle fully restored and backed up and halfway through the indexing. I did 1 folder and it works great. I am going to do it one folder at a time. I've already wasted enough time today so tomorrow it is

When it works it is beautiful. It's a mix of DRM-free prc and mobi and they work beautiful.
for %a in (*.prc, *.mobi) do mobi2mobi.exe "%a" --title "Folder Title" --author "%~na" --booktype "257" --outfile "%a"
I can't remember the last time I used the Kindle to read. I'm having way too much fun (uh, yeah...) tinkering with it and adding books to it.
Edit: Second folder failed. Files don't show. Backup snug and comfy on pc.