The blue line indicates the angle created by lifting the back of the foot to it's new height. I t's not surprizing that the distal border of P 3 is subjected to chronic bruising. The red line represents the cut I would make on such a foot. It happens that the red and blue lines are parallel. Click on the graphic for more.
L owering the heels is one way to reestablish pastern axis.
The effect it produces in stride is predictable. The effect it has on hoof shape is predictable. The effects it has on the horse who hosts it are predictable. T his handy-dandy Bump Checker can win you lots of bets. All you need do is bet somebody that the difference between the heights of the bumps on the sides of the right and left knees is equal to the difference between the heights of the heels of the right and left feet.