Hello gcaruana,
Tried your setting but still no go. Getting authentication error.
Was able to narrow this problem down when I tested with generic google account.
Authentication fails with "Access for less secure apps" disabled (default). https://www.google.com/settings/u/3/security/lesssecureapps?hl=en
With "Access for less secure apps" enabled, both SSL and TLS work fine.
Here is the problem" "Access for less secure apps" setting is not available under Google Apps for business.