For your set up you change your IC by changing what hole the front of the ladder bars bolt to. You stated you have 3 holes. Unless I'm mistaken, moving to a higher hole will move the IC back and up.
Moving the IC up and back will make it hit the tire harder, quicker and will most likely lower the wheelie height some.
If the OP moves the IC up and back he will almost certainly have to make the shock stiffer in rebound to keep the tire from bouncing back after the hit.