Hi just want to clarify what I meant with trimming with the flaps. If your controller have a turning knob or a slider and you map it to the flaps and you fly below the speed that the plane is trimmed for, for level flight, you just deploy flaps as needed for level flight. If you controller only have buttons you go to the "Assign Controls ( Advanced )" Menu. Here you choose "Buttons" in the "Assigned to" Menu, in the Flaps row. Then you choose "Move -/+" in the "Function Mode" Menu. Then you map the 2 buttons you want to use.
If the plane is not trimmed for full speed, you have to make a new edit of it in the Airplane Menu.
Good night.