At last some sense...
There is huge overkill on the types of hardware/servos used in jet models. I used to fly a Trim Spectre (recorded 167MPh in a dive) with a single Futaba 3001 servo and a plastic horn on the elevator. I logged 3 years of regular flights with no problems.
Just use some common sense and make sure you get the geometry correct use a short servo arm to get the most torque. Discs are the best option for strength before using a metal arm. hope this helps also...