RE: Speaking of physics - STS thought
The only way to totally stop correct the issue would be to install 2 V-channels lined with suppression material along the length of the string above and below the knock point and allow enough room for the fletching and arrow to pass thru. The channels would be mounted on at the end with spring steel to allow the string to move forward a little when the string hits it so that it does not try and throw the bow forward out of your hand.