Generally, this is an indication that your rudder trim is off-center.
Put it in the center, and check your yaw rate.
(It will spin faster in the direction that the trim is favoring)

Hint:
-Run about 1 minute off your battery to lower the voltage a bit.
-Next, use the instructions and the mixer on the 4 in 1 to trim the heli for center Tx trim. This should be the best overall trim.
-Sometimes it is best to unplug, and replug the battery after the first minute or so.... to minimize drift.... the biggest change is at the beginning, and end of the battery.

David