Sadly you cannot trim most of the planes in Flying Circus. For me it means that I cannot fly the Dr.1, Albatros or Pfalz because of the stiffness of my Warthog. It's very hard on my arm, plus I find it more difficult to control the plane wile pushing the stick forward with such force. I found a solution to this problem by trimming my joystick before flight.
If I want to fly the Dr.1 for example, I'll do the following:
1. Type "joystick" or "setup USB controllers" in the Windows search bar.
2. Select "setup USB controllers.
1. Highlight your