RE: Extra 260 (SD-models) trim question
I once moved CG forward and the problem did not go away. Since the 20oz fuel tank is located before the wing socket, the actual CG, when the tank is full, shouold be less than 6".
Another fact is that perfect stall turn is relatively hard to perform with CG at 6.5" (the recommended spot), this is a sign the plane is actually nose-heavy.
Could it be a design flaw? From side-view, the engine is positioned well above the wing center-line. The engine can be installed lower, but then it will not align with the cowl.