Those cursed little micro servos are no good for even a 40 size 3d plane, if that is you are using 3d throws. My first 3d plane had two of these on the elevator and it crashed due to both of them stripping. They worked pretty good for 10 flights and then wham!
If i were you i would go for at least Hitec HS-225 might minis, or a standard size servo. They have much sronger gears.