I used Futaba 9156(340 oz/[email protected]) on all surfaces except the elevator which I used 9157's(425 oz/in @6.0v). To me as long as it fits without too much grinding and the weight difference is negligble, why not go for all the torque you can get? The BLS 452 is advertised as a "car" servo. I don't know what that really means.

Marty