We are able to conclude that it is not a matter of power and/or body built difference, but it is a contrast in the way the club makes contact with the ball and/or the way the ball is struck; as a result, these vital differences let us have a better perspective and understanding in analyzing the ways wedges create spin.
A lot of our Fourteen wedges have a higher bounce on the heel portion, because when you open the face to hit, believe it or not it is actually the toe portion that hits the ball first, not the sole portion. To increase the bounce on the heel portion lets golfers feel the sole and will allow them to hit the ball in a consistent manner for each hit.
There is a difference between the thickness of the leading edge between RM-12and Jspec IV (see below)
Thickness of the leading wedge is thin (RM12)
Because the leading edge is thin and has a flat sole, golfers are able to accurately hit the ball, feel each and every hit, and can try different shots easily.
Thickness of the leading edge is thick (J-Spec IV)
With the leading edge is thick and the sole is relatively rounded, the club head slides well and is very forgiving. The player can control where and how he or she wants to slide the head under the ball and hit the shot just as imagined. (very forgiving)