Thanks for the answers.
Anyway i think it's unbalanced that a qunari mage does 30% more damage than any other race 
I agree that Qunari and Humans have a game mechanics edge over other races, but the edge is not as big as you are making it out to be, certainly not OP.
For one thing, you are cherry-picking the very best vitaar in the game, which most people aren't going to have until near the end of their playthrough. At least the last 25%.
For another thing, you're only showing one side of the balance equation. What about what Qunari give up? A Qunari gets less armor and no buffs attributed to helmets.
Examples:
Hat of the Inquisitor (Common): 12-13 armor, +4 Willpower
Fereldan Scout Hat (Rare): 21-22 armor, +10 Dexterity
Stone Stalker Mask (Unique): 50-51 armor, +9 Cunning, +9 Dexterity, +9% Magic Defense
Of course, Vitaar can also have buffs, so the balance comparison isn't all or nothing. They have to be taken on a case-by-case basis. For example, let's compare the Cretahl:
Cretahl Vitaar (Unique): +24 damage, +%9 Attack, +9% Crit Chance, +59 Max Health
You can pretty much ignore the +59 max health, since at the level in which you would get the Cretahl, that's probably less than a 10% buff, maybe even less than 5%. That leaves Attack and Crit, which are both very important and very valuable. But, notice that a rogue wearing the Stone Stalker Mask is going to get the same +9% Attack buff. They only get half the crit chance, but they get +9% crit damage buff on top.
Are they equal? Debatable, but even if we agree that they aren't equal, we don't agree that one is OP over the other. They aren't that far apart.