GPG Services expert settings
Important: Please only proceed, if you really know what you are doing. The settings that can be activated are hidden for a reason. We don't want you to be stuck with a non-working version or unusable keys or insecure settings!
Set ASCII armor as default
To enable ASCII armor as default output, open Terminal.app, paste the following line and press enter
defaults write ~/Library/Preferences/org.gpgtools.gpgservices UseASCIIOutput -bool YES
To deactivate ASCII armor as default
defaults write ~/Library/Preferences/org.gpgtools.gpgservices UseASCIIOutput -bool NO