I had the same problem with my SE with a OS 46AX and a Sullivan Tail Wheel.. All the guys at the field said they wouldn't fly it and mine balanced 3/4" back from the spar. Well, I took it back home, moved the motor as far forward as it would go. Added a 2 1/2 OZ spinner nut and another 2 OZ of lead in the nose. In addition, I replaced the steel tail brace wires with 50 pound fishing line. I have seen this same problem in several threads and it makes me wonder if the model needs to be revised. I too would like to hear what others say about this problem..Fred123[&:]