What you need to remember is that an Extra, being an aerobatic plane, is inherently unstable. This is due, in part, to it's midwing design that facilitates rolling. Without seeing how the plane is set up, internally, it's hard to really give input. One thing that may be happening is the CG could be too high. That could be helped by lowering the radio gear and battery pack(s) if they are not already mounted in the bottom of the fuselage