As was brought up earlier with regards to the trim tabs and elevator; the tab moves in the opposite direction to the control surface. The issue arises because FSX adds a pitch or yaw moment in reaction to the tab application, and the animation generally moves the tab. For an aircraft at rest this looks OK, however in flight the tab should displace the flight control, ie. down elev tab should result in up elevator. Not even some recent high end payware aircraft have figured this out currently. For aircraft with hydraulic controls it might work to animate the elevator deflection to have an additive to the manual position input. At autopilot cruise the plane in animation is really flying off the tabs and not the elevator position.
Bit of an issue, due to the way FS treats elevators.