Actually what I mean is not to ask you to make the missile's AFM 100% same as that in BMS, because from the video we can find the FM is absolutely wrong in the terminal guidance stage. As mentioned above, the guidance is not two separated stages, but I think these missiles should be close to pure pursuit at long distance from the target, and at short distance from the target, they should obey proportioal guidance law. The key to simulate the progress could be making the guidance more than one stage , such as three or more stages, to instead the complex function of realistic one. In a word, the AFM of these missiles is adequately accurate in aerodynamics, and the model in BMS is too simple but has something for reference to use to enhance the guidance of AFM missiles in DCS.:)