>>/436/
Yeah, it is a constant battle. You can go crazy falling down this rabbit hole, and it is easy to become unproductive. My very strong tl;dr recommendation in tagging is to follow two rules:
1) Don't try to be perfect.
2) Only add tags for things you search for.
Tags are for searching, not describing. If you aren't searching for 'series' tags, don't get lost in them.