what servo's are you using in the rear. i put one together with a saito .82 upfront and 1.5oz servos in the back for elevator and a 2.1oz servo for the rudder and i could not get cg without alot of weight. so i covered up the holes and put the elevator servo in the hatch area. that plane since crashed and i bought another one and i used a saito 100 more power ooohh yea. but any way i used the same rudder servo at 2.1 oz and some smaller elevator servos 2 hitecs at 1.0 oz at 66 or 70? oz of torque each. but it balanced out perfect no weight at 6.5 lbs. try smaller elevator servo's i bet it will make a huge difference.