So it took a couple hours of fiddling but it appears I have everything fixed!
I'm not sure which step fixed it, but I will list what I did in case someone else has this issue.
Uninstalled DazStudio > deleted the folders in AppData > reinstalled on my second drive where the My Library/Custom Content folder is
Backed up my Content > Deleted the content folder created by DazStudio installer > created a new folder and linked to it in Content Library
In Edit>Preferences>Content>Content Directory Manager under "Daz Studio Formats" I added the root folder, the parent folder, and the content folder.
At least one or a combination of these steps worked! I hope it helps someone else.