To resolve the issue, I ended up giving up on creating a custom workspace and just making my GOPATH point to one consistent folder. GOROOT was pointed to /usr/local/opt/go/libexec (seems to be where Brew installs Go).
Small rant: Go's setup experience is terrible. I get the fact that it's meant to have opinions, but something as simple as workspace placement and setting up paths...this should be taken care of by the installation process and make clearer to the developer installing the build tools. Booo!