We run into this as well.. although a little different...
Think last name + SSN, with a large universe of EDM SSN... Think stock statements, and think of a common last name, like Mr. Johnson, and then a common equity, say, Johnson & Johnson, and then the collisions with
123,456,789 units of stock (J&J) where the units collide with an actual SSN for someone with that last name...
I have thought about bringing first name into it in some way to address this.
Would be nice to combine data identifier and edm in one rule to help with stuff like this...