Just checking that you're using the Custom Query filter on the dashboard gadgets for maximum flexibility. I'm assuming it's available to the gadget you're using but I don't have that one available to me (I'm on the Cloud version and assume you're on Server). While the Custom Query feature won't help with columns, etc., it does offer the ability to select project, test execution results, and much more.
Re the JQL advanced filters, it looks like some of those should work for you but if not, you could try SmartBear support here: SmartBear Support
