Most of these are excellent pieces of advice, and practices I generally try to adhere to. I don't use schema as much as I used to, but timbre is fantastic, clojure.test is great, and all of the core points are excellent. I've never had cause to use agents or STM, and atoms are best used when enclosing some stateful function.

core.async is also great, but not without caveats, and it also has some strong footgun potential. I've written a little bit on the subject http://blog.goose.haus/2016/04/01/the-puts-and-takes-of-core... and http://blog.goose.haus/2016/04/04/producers-and-error-handli..., with more coming, but the tl;dr is that core.async will swallow exceptions by default and there are a few other gotchas.