Seriously what you need to do is make sure the link at the servo horn is maybey even closer than the closest hole in a new hole (that is where I have mine). What this does is increase mechanical advantage AND servo revolution AT THE SAME TIME. You can also move the tail rotor hub out a tiny bit on the out put shaft to increase the slider travel to maximum. Also adjust the servo holder so the servo horn is centered (perpendicular to the boom) with the sticks at neutral while the slider is in the center of its travel. Then turn on the gyro and adjust end points, trim ect. Y ou wont believe the difference it makes even with SG90's hehe.