Here are a few additional tricks to get the plane to hover. Slowly move the CG back, but do not go so far that it is too hard to fly or land. Fly along at about half speed, and pull staight up and try to keep the plane under control as it slows down to 0 airspeed. Try to find the throttle setting where you can keep enought airflow to maintain control. Stay high enough to recover. Since the engine is causing a lot of torque, if the plane is pulling to the left, you need to add right engine thrust, or mix in right rudder to full throttle, to help keep it straight. I have had to reduce control sensitivity by increasing EXPO or decreasing control throws to prevent being too sensitive. Try to see if the plane consistently falls out of hover in one direction, and change trim settings to correct it. For example, if it falls toward the canopy, maybe the engine has to much up thrust, or too much up elevator trim.