If it works for throttle/yaw and roll, it should be possible to get the pitch working too.
Here are some suggestions:
- Make sure you don't have any other joysticks/controllers connected, that might cause a conflict.
- Make sure you uninstall vJoy and Smartpropoplus if you have them installed. (Their driver messes with things when connecting via USB).
- Make sure you have "Heli" selected as model type on your radio. ("Plane" often doesn't work very well).
- Check if there's a switch on the dongle where you can select different modes.
- Perhaps you can remap the output channel (in the menu of the transmitter) so that the pitch stick sends to another channel.
Hope that helps