Tricopter VTOL - Constant wagging in yaw


We are setting up a Tricopter VTOL plane and in QHOVER there is continuous wagging in yaw. There are no errors observed in the compass and EKF. However while analyzing the log file, we see vectored yaw commanded in the tiltrotors. Default PID values are currently being used for Yaw. Could this be a tuning issue, any suggestions.

Log FIle