Yes, I have. But the Scorched Earth did consistently deal double damage+the toxic bite bonus damage on the dragon I used it on. Furthermore, Scorched Earth dealt +35 damage on its tick(70). With toxic bite active, it dealt 108 damage. After toxic bite has faded(or rather, the dragon that was affected with it died), the damage was 70 again.
Yup, this is it. Without the bite it should remain okay.
For a comparison, in a full-l25 setting I’ve had my dragon deal 154 and receive 309 damage, no racial involved. Hmm.