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Your tail motor may be going bad or you may not have enough mix if your using non head hold gyro. If you haven't replaced it yet, when you do, go with a gws b2c motor, it's a little stronger and lasts longer. Upping the tail pinion will help but will shorten the motor life pretty good as them little motors are working hard already. I'm using a powerful Razor V2 brushless motor and was able to use the stock tail motor just fine as long as no abrupt throttle punches...
Eolo Pro--Hacker C40 12t--Kontronik Jazz 40-6-12--GY 401--9253