I did hit up Konrad with a couple ideas to make "default" CWV a bit better when he ships to customers, though, after digging a bit just now.
And got it to 86 without much work or me bothering anyone else about it:
https://gyazo.com/40fd836f87f8c85fdcefe9d0f5ace63c
It did hit 90 a couple times, but 86 was the most common number using Lighthouse.
Probably worth mentioning that's on a server where I have a few WP installs doing way too much for way little return. If I disable those sites (most likely), it'll go up a bit just by server response being marginally better.