I'm pretty new at this, but I believe, and any body correct me if I'm wrong, that with out a HH gyro you will always fight the tail becuase of the counter rotation of the blades spinning. the more throttle you apply will increase the counter rotation torque on the body, do to the blades spinning harder, this will make the tail turn to the right. To every action there is a counter reaction. you will also notice that as your battery looses power your input on the rutter will change, so if you are trying to adjust that with your trim, you will always be trying to trim it out. You will always be having to apply some rutter stick input to keep the taill steady without a HH gyro, and that input will be constantly changing as you change throttle input, or as your battery looses power.