Auto take off tuning

ArduPlane Plane 3.8
1

Hi all trying setup auto takeoff
in manual mode it does not pull left or right on takeoff
but in auto as soon as it stop holding tail down ( TKOFF_TDRAG_SPD1 8 mps ) on the ground it starts going left
and i have ( TKOFF_ROTATE_SPD 9.6 mps )

TKOFF_TDRAG_SPD1 should i put the same as ROTATE_SPD 9.6 mps is there a config to add more rudder so it tracks Strait-line

2

In a non AP plane that is usually caused by not enough right thrust, would it help to correct that on the plane rather than asking the AP to correct it?

3

Tune your yaw damper. http://ardupilot.org/plane/docs/roll-pitch-controller-tuning.html#tuning-the-yaw-damper