I have a Naza and was surprised to see there was no input for refresh rate like there is on the XA software, I have no idea what its default is but from what Ive done so far I think the XA FC1212 + AHRS performed better in the gimbal department.
What speed are your servos? I had to upgrade my roll servo to a Savox hi speed, hi res (1258TG type that come as stock with the PH gimbals). this made a lot of difference. Still nowhere near acceptable yet except in no or very light steady wind when gimbal stabilization is barely needed anyway.