[Danimal]

Welcome to the forum and the most addictive hobby you will ever encounter.
The drift your describing is a naturally inherent trait of all heli's that have a tail rotor even the real ones. The tail rotor is used to counter the torque effect of the main blades that want to twist the hole heli around with them. The side effect is that the tail blades create sideways thrust that will push the heli. You will need to learn to counter this with a little right bit of right aileron at liftoff and once up you back off. Actually you will need a little bit of right tilt to the rotor disk to maintain a stable hover.