Hi Kevin,
I think you should be able to accomplish this using a Not Lead was Created filter plus a Filled out Form filter. The filters should use OR logic.

The Not Lead was Created filter is constrained by Form Name = the same form as the trigger.
But what if the lead was created by this form in the past? That's why we need the Filled Out Form filter with constraint Form Name = the same form as the trigger, and Min. Number of Times = 2. The first fill being their past fill and the second+ one being this specific fill.
So the only leads that will quality are the leads not being created by the form on that specific fill.