How to balance a propeller aircraft for left turning tendencies?
There are several ways, and the most effective vary their own yawing moment contribution with engine thrust:


A trim tab on the rudder which forces it into a correcting deflection. This trim tab can either be adjusted in flight or only on the ground. The flight-adjustable trim tab is set according to flight speed and is used on airplanes with a wide speed range.
Mounting the engine at a slight angle to the airplane centerline. This places the propeller at an offset which produces its own yawing moment.
Camber on the vertical tail. Since the tail is in the propeller slipstream, it experiences a relatively higher dynamic pressure at low speed and high engine settings, just when the p-factor is biggest.