Trouble Referencing startTrigger data

I'm triggering a workflow as a form submit handler/resource query within an app. Using "Raw" and {{}} to set the parameters.

On my workflow run history I see the params coming through:

I'm referencing as such on a query:

As you can see though, they're all null and the query isn't executing properly.

I can get it to work If I fill out "Test JSON Parameters"

You have it right. You need to define the incoming parameters in the Test JSON for them to be passed along. The test JSON values are only used when you are debugging the workflow, otherwise it’s the values you pass (to the keys defined in your test JSON).