The wrathcalcs model for windsong is setup to model the described rppm system but in practice it does not work as modeled.
@Juvencus, the difference shown, as I stated was a worst case windsong (which will never occur, always being better than shown) beating out a best case jade spirit (which will never occur, always being worse than shown).. on average windsong is a large bonus vs jade spirit. Also you do realize int gives a lot more than 1 dps right? The numbers are based on stat weight, as in its normalized to one of the stats (in this case, int). Actual DPS is going to be around 3.5 dps per int.