The half shot spin is a very difficult thing to calculate, as in real life, it really depends on the lie.
If I have a really tight lie where I can make perfect contact, the ball will launch lower, however will carry more spin. Even opening the clubface, you will still get the lower launch but more spin. It's caused by the soft urethane cover on today's ball being pinched against the clubface and causing friction.
Fluffy lies make the ball slide up the face... Causing a higher initial launch and less backspin.
On my launch monitor at work, I can generate spin rates of 13000 rpm with my 60* wedge, because I can get a PERFECTLY clean contact off the mat.
Outside, on our usual bent/poa grasses, I can only generate 8000-9000 rpm on the same shot, because I can't get that perfectly clean contact, as the grass grows "up" and gets between the clubface and ball, and "lubricates" the strike.
On a super tight cooch/bermuda lie the spin goes back up, but still not as high as the shots off the mat.
I think this is a particular shot that is going to be very difficult to simulate 100%
