Hi,
it seems to me that the Equation 6-11 (Fitness Equipment Device Profile, Rev 4.1) of the Wind Resistance is wrong.
First, it's not very clear the unit of measure of the Relative Speed. In fact, the Wind Speed is measured in Km/h and there is no reference for the unit of measure of Bicycle Speed.
So, if the Relative Speed is measured in m/s then the Wind Resistance formula should not divide the Relative speed by 3.6.
If the Relative Speed is measured in km/h then first part of the 6-11 equation should be fixed.