I created an SSTO to take to different planets on my Space Station. It worked perfectly without the ducted fans. With 1.9, I decided to try them to save fuel and weight. Now, every time it is airborne, it slowly twists to the left. I keep SAS on, but it does not help. All parts were applied in mirror fashion by the system. From what I can tell, my center of gravity is slightly ahead of the center of lift, just like it should be. Both are going down the center of vessel. After displaying my aero forces, the root of the problem is in the cargo, from what I can tell. It seems that the cargo is now generating aero forces while enclosed in a MK3 cargo bay. Does anyone know of a way to fix this?
Below is the .craft file for the SSTO in question. I don't have an image account, sorry.
Science Rover SSTO