This may be a silly question, but did you go through the transmitter calibration? If you don't calibrate the sim for your transmitter, you can get the sorts of behaviors you're describing.
Alan (just call me "Bum"; no need to be so formal)
DT520Ev2 (VBar), Blade 180CFX
Experience is something you gain only after you need it.
I wouldn't mind social media so much if it didn't involve people.