Interestingly, I didn't get a webmention of your post (directly or via micro.blog), but came across it because I follow you either way.
I'm happy to throw in a spurious feed if you want to test it and see if it updates automatically, but I've also been adding a handful of new feeds a week until I can get things where I'd like them to be. Hopefully you find it valuable!
Webmentions are confusing me. I though you would get one from this, posted this morning / johnjohnston.info/ blog/ hmm-your-mention-just-showed-up-here-today-i-think-micro-b/
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John, Jul 11 2017 on stream.boffosocko.com