0704b HH gyro help

I need help! On my esky belt cp v2 I have to constantly apply left rudder to center the tail. Gyro I think is working fine. Belt tension is good. Change rotor assembly with copterX. Swashplate and paddle bars are level. 0 pitch and blades are tracking perfectly with cf blades. Change tail blades with copterX blades. Had the lhs replace my tail servo with hs65mg servo (not sure how to replace a servo). Moved the tail servo 1mm aft twice. I think my tail shaft is straight. I know there is an adjustment on the HH gyro(ek2-0704b) limit and delay trim. Don't have a clue what they do or how to adjust them. Helicopter hovers great no vibration I just have to apply left rudder. Stock tx, no tail vibration or wobble and the gyro trim on tx is at 10 clock position. Any help would be greatly appreciated! My left thumb is wearing out. Thanks Guys!!

Hi,
It is small change that this will be, but maybe when you plug the battery you instantly move the heli? Then the gyro works bad! When you plug the battery don't move heli until gyro initializes