Check your battery voltage under load, the 401 can get squirlley when the voltage drops off, right up into resetting in flight (trust me you don't want to find out about that)

Also when you say 95 percent are you talking about the gain? If so feel your servo when you land, I'll bet its getting hot, if so you are running to much gain. Only run as much gain as you need to hold the tail during fast sideways or backwards flight, any more and you are over working your servo.

Also where is the limit dial set at?