why is everybody yelling in these forms????
If you turn one servo around the linkage won't match, the travel will not be the same on both servos and the plane will roll out of a pullout from a dive or will cork screw a loop.
You need to use a reversing y or a HT programer.
Larry
ORIGINAL: more power
NOT SURE OF WHAT RADIO YOU HAVE BUT A Y HARNESS IS YOUR BEST BET A SLOW SERVO MIGHT BE BECOUSE OF A WEAK BATTERY SHOULD RUN A 6 VOLT BATTERY ON ANY HIGH PERFORMANCE PLANE OR REVERSE ONE SERVO IN THE PLANE HAVE RUN MANY DUAL SERVOS ON ELVATORS , COULD BE A BAD SERVO // CHANGE IT OUT FOR ANOTHER ONE AND TRY AGIAN GOOD LUCK