Volts really high with acceleration.

Also it could be a bad ignition. That blue wire on the center ( I terminal) of the regulator comes from the ignition. If you have dirty contacts the regulator will see less than battery voltage and will over charge. Also if the contact is dirty it can also cause the dreaded flickering light syndrome. I fixed mine with a relay that provided battery voltage from the starter relay directly to the center wire on the regulator. You can try this theory out by running a temporary wire from the battery or starter relay to the center i terminal of the regulator, if the voltage returns to normal then I would look at the ignition switch or install a relay.