Look through the aircraft.cfg file where 2K2 wrote all the air file parameters and there's a section called "[flight_tuning]". This is where the effectivity numbers are. To fix the rocking issue, adjust the roll stability to 2.0 and aileron_effectiveness to 1.5. This does well for large and small jets, and anything that flies high and fast.
Locate the aircraft.cfg file for the plane you are working on and add the following line under [pitot static] subsection. If the aircraft does not have a .cfg file you can create one!
[pitot_static]
vertical_speed_time_constant = 1 //try a value larger than 1