With all this taken into consideration, still does not solve the issue unfortunately. I have included a link to video that I took showing what the aircraft(s) are doing. It isn't just this model of POSKY's Legacy 600, but it also does it with a Delta repaint of the Legacy 600 as well. I apologize, the quality of the video isn't that great, but I hope it brings the point across.
http://tinyurl.com/osbx53q