Change #2: Tackle Mastery
This is widely considered by the community to be a useless addition to the game, due in part to Fist of Fire currently being a damage increase and Fire Tackle having a potency boost. Along with the Fist of Fire change noted above, I offer the suggestion that Fire Tackle be changed in kind: instead of an increased potency, give it a different additional effect. Increased tackle range or dealing conal AOE damage on impact would be solid options. Again, open to suggestions from others.