A touch of rudder will initiate the rotation, but the spins stop as soon as the controls are neutralized. At this attitude, using rudder control while holding full up-elevator and carefully managing the throttle will allow you to fly at a slow walking pace. Unfortunately, the noise level also rose proportionately. A trim change is not necessary at slow speeds, unless you fly very slowly. There is ample rudder authority and, therefore, no need to enlarge the control surfaces.
Inverted flight is very stable and requires only a minimal amount of down-elevator to hold a line.
With the power available from the Brison 6.4, vertical rolls are limited only by your eyesight, and the plane accelerates nicely out of vertical snap rolls. With the 300L, the only limitations to aerobatic flight reside in the pilot s thumbs.