you need to focus on not letting your head keep turing. What the videos and the amount of over rotation is porportionate to how much you contuin to look over your right shoulder. by about 1/2 way around you should be finding a spot to focus on. I try to look for the see spot of the wave, some use the back of the boat or the tower, it just depends on what is confortable to you. Also try to slow the rotation down a little bit by not using so much hand drag. it will make it easier to stop to rotation.
Lastly stoping the rotation comes from some front foot pressure, you should be transitioning back into your regular surfing weigt distribution. to much back foot weight will make it easy for the board to just keep on spinning.
Hope that wasnt too much.