I'd use a smaller bore size like a .678 or .679. That will help and no I don't have a gauge. Sweetspotting a reg is pretty easy. Turn your ivg out until its flush with the back of your gun. Turn your reg all the way down and slowly turn it up. Shoot everytime you make an adjustment on the reg. Keep turning it up until if you turn it up anymore, the velocity starts going down. Once you have reached the "sweet spot" of the reg you can adjust the finer velocity with your ivg.