Enable the 'compress_data' parameter in the '/etc/cb/integrations/event-forwarder/cb-event-forwarder.conf' file to compress syslog data:
compress_data=false
Additional Information
A restart of the cb-event-forwarder services is required when making any configuration changes: https://community.carbonblack.com/t5/Knowledge-Base/CB-Response-How-To-Restart-CB-Event-Forwarder/ta-p/80741