This question could be difficult: I love the SM4 60 degree L grind wedge with 4 degrees of bounce. (I have tested this out from a friend, and it likes me back.) The SM5 60 degree L grind wedge also has 4 degrees of bounce. Is there a difference between the two? I realize the grooves are different, but what about the shape of the wedge, or the shape of the sole? Do they differ in any way?