I found some posts about vectored yaw by @Rolf and @tridge in the Tiltrotor support for plane thread. There is a parameter called Q_TILT_YAW_ANGLE that may need to be adjusted. I think mine is set to 13 now. I am not sure what effect this will have on the wobble but it seems that something other than the Q_A_RAT_YAW settings may be at play here.