there are two orange screws in front of those servos. You can loosen/tighten (slowly/carefully) them to adjust the twitching. Most inexpensive RTF planes (in my experience) are subject to a certain amount of twitchiness on the servos. Most of the time, the twitches aren't enough to interfere with the flight characteristics.

Although it is pretty much already set on the Skyfly, be sure to check your center of gravity. Other than that, that sucker should soar.
Good luck.