By the way, are you using the PW2 or PW3 version of the Webmention plugin? I'm still on PW2 myself but will likely switch to PW3 in the coming months. I plan to support both versions for a while, but since most new people will be on PW3 I'll feel more comfortable once I'm running that on my own site as well.
I’m using the PW3 version. 👍