I understand that plane set up is a big part of it, most of it actually...However I have spent along time on setting up my plane. I used the Peter Goldsmith list for trimming an airplane. I followed it to the T, and did everything it said to do. What I ended up with is a plane that flies better than any other plane I have owned. Beautiful up lines, and down lines, tracks like its on rails, the only thing I have to do is fly the maneuvers, the plane takes care of the rest because it flies that well. Yet I am still getting bet by the 35% and 40% planes. The contest I won was with a 35% plane that was loaned to me for that contest. Now I did place second in a contest with my plane, and every plane there was bigger than mine. I am new to IMAC and enjoy it very much, just wondered if a 33% would be sufficient enough. With my 73 inch plane the wind makes things difficult. I practice in the wind, and can keep the plane straight in the wind, but it is difficult, and it seems that the bigger planes handle it with ease.