Another easy trick is to put a shim under the trailing edge of the wing on the saddle. Go an 1/8 of an in at a time till it flies flat and fast. You'll have to keep adding up trim with each piece, but it will be much more aerobatic and won't balloon up with increased speed. Might better get an instructor to set it up for you as you can go to far. Also much easier to fly in the wind.