You need to consult with a traffic attorney near you. In the meantime, stop relying on cruise control and instead be the slowest driver on the road.
Your ticket is a substitute for your license and in lieu of bond, so you can continue to drive but you really need a lawyer. If you have a working speedometer in your vehicle, you should have known you were speeding, regardless of the computer, even if you did not know the exact speed. A lawyer will help you minimize the damages.