I know from flying airplanes in real life that neutral trim is what you want for cruise. The angles of the wings and stabilizers should give you pretty close to neutral (zero) trim for the pitch, yaw, and bank planes.
However, most of the planes in CFS3 aren't close to neutral. The Bf109 is really bad--I think it has like 60 to 80% down trim in cruise flight (I do cruise at 80% power in this game, which is the power setting recommended in all the F1 checklists). That would be just annoying, but when you go to full power and get up to high speed, you cannot descend--you don't have enough down trim, so the nose rises, and you can't descend again until you have bled off some airspeed. That means you can't follow many aircraft in dives because your nose will rise on its own.
Anyone else notice this or have a problem with it?