The OP's airplane has a plug in wing. Should just move the tube and mounting hardware back, problem solved.

I like my airplanes light. I like them with low polar moments. Since I build most of them, I have more options available to me than people that assemble ARF's. This allows balancing the wing by sorting ribs, and the rest of the wood by weight. The equipment (engine, servos, batteries) are all picked with the idea of minimum weight with the require performance. Even the spinner selection is usually limited to Tru-turn, because the engines just run better with them, and they are light weight.

I agree with Shawn, that it takes about 50 flights to really dial in most models, but it is totally unnecessary for many model pilots because they just don't have a feel for it, and quite frankly never will. You can get about 90% in about 5 flights, but you never get 100%. Sometimes the deck is just stacked against you, and it' so subtle that you never know why. I've seen too often that a slight problem in shaping the leading edge of the wing manifests itself as an airplane that will never trim out or have that solid feeling.