The spawn button that a spawn point gets assigned to is determined by the direction the spawn point faces and not the location of the point relative to the field. In this case both remote spawns face southwest; and since only one spawn point can have the button, the last point added during the making of the terrain to call the SW button gets it. Therefore, you have to use one of the .fly commands to get to the west spawn point. But which: .fly 0; .fly 1; or .fly 2?
Since there are only three vehicle spawn points from that field and we know that .fly 0 is always in the Hanger and the last SW spawn (.fly 2) using the SW Button did not go to the West spawn like we hoped, then .fly 1 must be the command to move west and indeed it is. As you can see, it is all quit elementary my dear Watson.