bill,

Most of the guys I hear are using 3/4 inch up and down elevator and 1/2 inch on the alerons. I''m *****g on the rudder. Most important is going to be the CG on this bird. My all up weight will be close to 20 lbs with smoke..... HD robart retracks and gear add up. Double battery set up plus one on engine and one on smoke system.....I''m not familiar with those JR servos but they should be metal geared and High torque.
Post pics when you can.

MC