As pointed out, you're wrong in just about everything you have said Brian. First off and most important for the poster, NORTH CAROLINA IS A FAR CRY FROM CALIFORNIA. Even for California, what you've said is wrong, but I'm not going to argue those spurious points.
Neither speedometers nor cruise controls are instantaneous responding devices. Your argument that you didn't notice the needle leaving 63 is likely not going to be a viable defense against the testimony from the officer that he clocked you at 65. Your first problem is that 63 is still the same violation you were written up for even if the court would be gracious to admit a possible 2 MPH error. The break at that level comes at 15 over.
As for mitigating, you can dodge the points if you ask for and are granted a PBJ if you are eligible (i.e., you've not been granted one before). A lawyer might also get this reduced to an equipment violation, but this typically will cost more than the fine will cost (even if you want to try this pro per, you'll need a certification that your spedo was off PLUS most likely that you correct the issue). Unless you are having a problem with points, it's probably not worth the effort.

