WAY overkill. I think any of the .40ish FF type planes fly fine on standard servos like the Futaba 3004 or Hitec 422/425, BB is a nice addition and will be a bit smoother while in operation but mostly will wear longer than non-BB.

The only change I would make would be the rudder servo should be something in the 70 ounce range and that is plently. This really only applies if the rudder is big, like on most of the .40 profiles. You can use a standard on the rudder in these planes but the higher torque servo is better.

I think where most guys screw up is in the linkage set-up when using standards. With the lower torque servos you should pay particular attention to the servo arm length, surface horn length and how you connect these together. In general you should try to keep the arms short or connect the linkage as close to the pivot on the servo as possible to maximize torque. Likewise, the opposite applies at the surfaces, keep the clevis connected as far away from the hingeline as you can.

More often than not these smaller planes fly better with lower throw/maximized for torque and leverage than with huge surface throws and a very low leverage. You should apply this on ALL of the flight surfaces.