OK, I've found a solution to the excessive yaw problem. Sorry I had not had time to do this earlier people, work has been hectic.
OK, first uninstall the game. Make sure you do a restart, and run a registry cleaner to clean any entries for EECH2. Restart your computer. Go to your Saitek software, and centre ALL of your buttons and knobs. Reinstall the game, and you should be good to go.
For some reason, attempting to re-centre and trim everything just does not seem to work after installation.
Good luck all.