Gonzalo38,

I think the wing walking that you are referring to is only on the ground - correct? If so, I believe the problem is under carriage and /or wheel alignment related. First, if the oleo pressures are too low then the plane will rock side-to-side like that when direction changes take place. Second, if the nose wheel is under load, like with heavy braking or when the plane has a negative AOA on the ground, you can induce that kind of wing walking with nose wheel direction changes. Finally, and this is what I suspect, your wheels are aligned slightly toe-out, perhaps more so when the under carriage is under load, which translates into an occilation from side to side as first one wheel and then the other let's go from tracking outwards. May I suggest you try two things before you try to 'fix' the problem with a gyro of sorts;

- give the main wheels a bit of toe-in.
- get the nose to stand a little higher.

If that still don't help, increase the oleo pressures in all the oleos.

Hope you find a solution mate.

Cheers,

JanR