Don't worry about the size of your plane. Just practice the sequence and fly against the judging criteria set for the maneuvers and you'll do just fine. One of my first contests I practiced a bunch in the spring, brought a .40 size Extra out to the contest, and placed first against many pilots who brought out bigger equipment including a 40% 3W Extra. In basic, you'll find pilot skill varies widely and having a larger plane won't help those who haven't practiced or don't know what the maneuvers are supposed to look like.