Thanks Jim - my primary observation is between the Pro 60 and the Master 60 - both wedges are rated exactly the same. One goes 90 (Master), the other 77 (Pro). They have the exact same loft. Given the exact same circumstances, i.e., a full shot, same ball, full backspin, same wind - the Master wedge spins back, it seems to me, at least twice as much, if not more, than the pro wedge, despite the identical loft.
I am thinking about your theory that the longer distance means more spin; but I would think simply having more loft = more spin. For example, the TM 64 degree Pro wedge spins back (it seems to me) a lot more than the 60, that makes intuitive sense to me. In sum, this is how my wedges work to me:
1) Master 60 (90 yards) - most bs of any wedge
2) Pro 60 (77 yards) - not much bs
3) Pro 64 (50) - somewhere in between, but a lot more spin than the pro 60.
Maybe I'm just confusing it.