I'm using F540 maxflex. In rigid mode so far, since the crop is still somewhat standing.The hybrid Lexion has several pans that shake back and forth. They seem to not be perfectly balanced, as the machine rocks back and forth when engaged at idle. This is normal, but not ideal. At full throttle, it seems less noticeable, and while harvesting, I really can't tell.
What header are you using? It needs to be calibrated if you expect the auto height to work. On a 2011 740, raise header, lower header, raise header, lower header, done. You do this manually via joystick. I have found that blocking the bottom of the feederhouse, so it doesn't mash the header into the ground results in a better performing calibration. When you calibrate, you only want the height sensor to become fully depressed when lowered, and no farther. When you raise, you don't want the height sensor to float around (macdon, or any other header that can be set too light).
If you have a macdon set light for the conditions, you can temporarily make it heavier to do a good calibration. Two things, turn it off with crop on it, unhook pto, then calibrate. The weight of the crop can help it not float around as you raise and lower header during calibration. I also don't like to calibrate with the header running, as it is distracting and unpleasant to run a header while mashing it into the ground, especially if you can't block the bottom of the feederhouse.
Secondly, extend the reel forward can also make it heavier then it typically is, also helping.
So Go into header settings, set height limits( I forget the exact words), the book says to follow the instructions on the screen, which says Header Up. Not matter what I do, it comes back with Too Soon Released Key. I assume that is the calibration you are referring to? Does header height rely on the feeder house angle sensor, or the sensor arms dragging on the ground?
What I want it for, is so I can switch between standing, and flat crop with a single button push each time.