Yeah, the number ratio is my next goal. Considering mine was swimming down there in the sewers, I'm quite glad it's been picking up since.
Personally I use social media because until recently the internal distribution used to be alarmingly low. By now I always get a good 50-50 of both, with the ratio shifting here and there.
If Medium pushed my stories on its own more, then I wouldn't be promoting anything on social media. But then we're back to the read ratio and the other stats that make the algorithm pick up on a story.