if the jetway aligns well at an FSX default airport / jetway, the exit cordinates are correct.
The issue is, they don't. Not even default airplanes at default airports aligns correctly at every gate or every airport. For example, the default CRJ-200 at default airports, often result in jetways with wheels sunken into the ground. The system has several issues.
is FSDT reading the same data ??
We are not reading anything. We don't move the jetways, FSX does, and it's FSX that reads the aircraft.cfg. We don't do anything to animate jetways, we only customized the model, but it's FSX that handles the movement and the relationship with the airplane doors.
Of course, as you noted yourself, since our jetways moves correctly with the Aerosoft A320, clearly means our models are working so, it's an FSX issue.
One of the thing we are considering for GSX, perhaps not the initial release, is to replace the FSX default jetway handling.