Hi,
Remember, the backspin on irons is not actually backspin you think you will have. I.e. ball actually spinning back few feet as you would get with wedges. Backspin on irons means ball will stop much faster after it lands.
I rarely see i15 irons backspin, but i see it stop on the dot in same spot where raptures v2 may run 10ft by. That's the difference.
-wgticon