A large percentage of my stories are imported from my blog as well. But a question for you: I've heard importing is less effective because this method will post the original date of the post, which may be considerably older, and Medium doesn't prioritize older-written posts. What I do instead is copy and paste the content, then go to story settings, advanced, and click "this story was originally published somewhere else" then paste the link in the canonical space they offer. Only takes a few more seconds to do, but apparently is more effective for better reads (and for SEO.)