Thanks for taking the time to answer. I don't understand why in the dj combination, j is able to reach under d for what looks like a kerning of about -4, when the auto_kerning_min property is set to -1 or -2, keeping Fj apart.
Maybe they just manually kerned "j" with the lowercase letters? The "j" line on the lowercase sample would jump out pretty strongly in a way the capitals-with-j don't on the mixed-case one.