This is a well-thought out response; I like it. I have a very similar policy, especially regarding Choose Not To Warn. Tags are the best, though I developed them slowly -- in our classic Post Fic To Livejournal days we didn't do it, and while I love it conceptually I often struggle with finding the right tags. There's a tag cloud for AO3, thankfully, but it's not fandom-specific, which I'd prefer.