If you enjoyed Outliers (or are thinking about reading it), I'd suggest reading Peak (in addition to, but also instead of).

https://www.amazon.com/Peak-Secrets-New-Science-Expertise/dp...

I'd suggest learning more about how to learn better, so that you can learn more on the job. Then you can spend your weekend doing something other than coding. Some useful books:

"How Learning Works" (I review it here: https://codewithoutrules.com/2016/03/19/how-learning-works/)

"Peak" https://www.amazon.com/Peak-Secrets-New-Science-Expertise/dp...

Gar Klein's books, in particular "The Power of Intuition" https://www.amazon.com/Power-Intuition-Feelings-Better-Decis...

"It seems to me that passion and a lack of intelligence seem strongly correlated"

This is actually categorically false, see the book Peak by Anders Ericsson for more information on this: https://www.amazon.com/Peak-Secrets-New-Science-Expertise/dp...

people who are passionate are MUCH more intelligent and knowledgeable about issues and it's been proven.