The volt meter moves with the flickering, as the engine speed increases the flickering and volt meter smooth out, does not jump around as much, but still flickers........ Thanks
You likely still have a voltage drop some place, or a "loop" formed causing a feedback.
One thing you might try is to "tap into" the regulator power wire as close as you can get such as where it all tee's together at the ballast, and jumper from there direct to battery with a clip. See if that temporarily makes things better.
It that does not do it, jumper a good ground direct from VR to battery, and if THAT doesn't clear it up try a different regulator. Pay attention to the connector make sure it's clean at tight, the VR connector that is.