As this thread has restarted probably worth saying that after a couple of weeks using the set settings above, fairly successfully, I have nevertheless decided to revert to using AFS. Yes the AFC with those setting works good in great conditions but in less than ideal light I am still more comfortable using AFS. I also find myself losing focus because I, the operator have lost the subject when using AFC.
Recent and not so recent pictures here
https://trevorc28a.wixsite.com/trevspics
and 2021 birds here
https://photos.app.goo.gl/61f38oB1EYAAYAqE7
So you’re using AFS with Animal Detect and, presumably, single frame drive, since burst would quickly go out of focus. Is that right? Shutter release or BBF? Also, do you rapid-click (like a “manual burst”) or choose your shots? Fewer shots to cull? Better hit rate?
Are you seeing better main subject focus, rather than background, this way? Does it “stick with the bird “?