I would use something like the Hitec HS-5645mg. Since the airplane is slightly lighter than similar sized airplanes using a 162 inch ounces of torque on the elevator and aileron is ok. On the rudder i would use something like 180 inch ounces. This way, it is almost impossible for it to flutter. the recommended servos is what you should use on a 60 3D airplane's rudder
IMO 86 Inch OUnces of torque is not enough, even if you are just flying around.