This is how things get broken.
Don't change two jobs at the same time. If one is underpowered, bring that one up, but leave the once overpowered job the same.
If you buff one; nerf the other, they're just going to swap places. Like the situation with PLD and WAR. They buffed PLD, nerfed warrior. Now they just swapped places. They should have just buffed PLD and left it alone.