Could be your Pc resolution setting. Try changing that (lower the resultion). Or choose a field that has less trees,mountians etc. If the plane is handling fine up high, and gets jittery or touchy close to the ground, then its a PC issue. Graphics card basically not keeping up. I have have an older desk top with basic installed, and if I try to load a busy Airfield, I will notice frame skipping (slight) when taking off and landing. It will get worse when I activate smoke.