One sec, Lemme open my world editor.. Do Do Do..
Ok, This is what you do to change how much damage is for each attribute that is your primary.
Gameplay Constants >>> Check the box on the top left >>> Hero Attributes >>> Should be the first one, That should explain it. To make it higher or lower just change it. Its how much your hero's damage goes up per attribute that is your primary.
SEE I CAN HELP TOO!!!