Antonello-
Another thing to consider is your frame rate. Shooting at 30/25/24 frames per second will give you some noticeable blurring during pans, rotations and even pass by's to very close objects. Especially when the frame is filled with mostly monotonous contrast like heavy vegetation/bushes/forest/grass, even water. So try filming at the 60fps setting and you will see a genuine improvement in sharpness of your shots when flying or changing camera angles.
You can also select Precision flying speed and set your "full throttle" to a slower velocity to reduce blur. Precision mode is very helpful for getting that professional movement and has a wide range of speeds to set depending on the shot you will be taking. When you switch to Precision you will notice that the yaw rotation speed as you pan the camera will be correspondingly slowed too which gives a great match for your maneuvers. Most helpful when you are doing a manual orbit of a subject when needed at an altitude level lower than the minimum safety setting in Intelligent Flight Orbit.