Things to check for tail wobble?

[expertzx]

I notice that whenever hovering and I suddenly give it an increase in throttle and pitch, the chopper will shoot up in the sky vertically as I want it to, but it seems that when the headspeed increases there is a quick wagging of the tail. It just will do it at that one time for a sec or two and not happen again until I do something that increases the headspeed again. Played with the gyro settings and it's not helping. Wish I could post a video on youtube so it could be seen.

I've read about some other issues with tail wobbling and it seems as if the problems were servo arm related, gyro gain related etc. But I've checked my setup and I'm wondering if it has something to do with my TT? The engine is running a little rich which I understand could also cause this problem, but it seems the problem is worse whenever I lean the engine and engine rpm increases.

[Mercuriell]

Initially try notching up the gyro gain ~2% as it sounds there may be a bit of lag in the gyro