If the contact is not consistent you will want to continue the coning process until it passes the test.
In order to center your clay on the wheel, you will need to cone up and cone down. Set your wheel speed to about 80% (full speed is too fast!). First, ensure that your elbows are stabilized and locked to your legs. Then, use your hands to push the clay up into a cone shape, and press down on the clay with a flat palm to cone down while holding your other hand against the side of the clay to prevent it from protruding too much. Keep repeating this process until your clay is centered, and add more water to your clay as needed. You will know when it is centered when it is no longer wobbly. To check if your clay is centered, hold your pointer finger in place close to the side of your cone. As your clay spins take note of whether the clay hits your finger throughout the rotation or just a certain point. If the contact is not consistent you will want to continue the coning process until it passes the test.