Here is a picture of an enlarged rudder on a US60. I got the idea from Dave Robelen. He did the same thing to a US120. It is held on with packing tape for a trail. It did provide more rudder authority but I still ended up using 2 mixes rudder to down elevator and rudder to aileron. Trying to fly the Ultra Stick in knife edge made me want to hold too much elevator when I started flying my Extra and profile Katana which has almost no coupling.