After smoothing you can observe slightly incorrect positions of the gimbal in the 3D-preview and a kind of flickering around the correct POI-spot in the video. At the moment I adjust every waypoint manually into the wanted direction of the POI to reach a better result.
But this is rather inconvenient in case of numerous waypoints after smoothing. The lasso function doesn't really help in case of big fingers on a small smartphone screen!
Solution (as far as I am able to understand the process): Adjusting the gimbal to the POI should be the last step after the smoothing calculation.