As has been stated move the servos a little bit at a time but, before the servos are moved do some math. You'll want to move the servos in proportional increments.
Say you want to move one servo 30 degrees and the other servo 60 degrees; 30:60. 30/60. 3/6. 1/2. So one servo will move 1 degree to the other servo moving 2 degrees per torque commend; to get the servos to arrive at the same time.