How much weight is everyone adding to the plane? I've built it as per the manual except I move the fuel tank back into the secondary position and used carbon fiber rods and robart hinges, Ignition and the battery are in the fuel compartment two servos in the tail. Looks like I might have to add about 2 lbs. of weight. the engine I am using is a MT 35 beam mounted. I've read that some are adjusting the C.G. 5 7/8- 7 inches back from the leading edge. Is that correct? Michael