Reverse servo direction in transmitter. Calibrate radio in Missionplanner making sure that bars are moving the right way (Same way as sticks, except pitch, that should move opposite stick direction). If not, reverse them right on the page where you calibrate transmitter in Missionplanner. Check if servos move the right way in manual. If not, reverse the servos that turn the the wrong way in the SERVOn_REVERSED parameter. Now compensation in FBWA will be correct.