Included is a link below to a log from the latest flight of my quadplane. I appear to be having some sort of a yaw issue during the transition from Qhover to FBWA there is noticeable yaw movement which can been seen on the log as 4 decreasing peeks in ATT YAW. My question is how can this be stopped and should I also be concerned about the 4 large peeks when in horizontal flight .
Sounds like a good test. Some other things to try is the link below and also consider the possibility of magnetic interference from the quad motors into the GPS/Compass module. Try using just one compass.