If you have my V922, you'll realize how loose the tail boom is. If I don't glue it, it may come off during flight. I did not use CA, I use glue for making art and craft. It's mainly to fill up the excess gap between the boom and the socket (think of it as adding friction).
Tail wag was not present when I first flew it. Tail wags after I crashed it badly and found the boom cracked. After replacing the broken boom, tag wag is gone.
In this case, it is not caused by a high gyro gain.
If you fly this thing, you'll realize the head speed is not enough at Idle-Up. I have the impression that the typical Idle-Up throttle curve for micro CPs is 100-100-100-100-100. Am I right? I don't think the curve for V922 is like that, and I can't change it.