First question,,, do you have auto mode set?
If yes,, then go to advanced settings, mode two, and slow down The control axis that are going to fast,( gun I'm sure)
If no,, set it to auto,, it should then switch from airplane control mode to GV control mode when you up one or the other then set up mode two too your liking in advanced settings.
I don't use the mouse so I'm not sure about setting it up but if you like, we can go to the TA and work on setting you up!