I've noticed that all the higher speed (10-11) discs have the wider rims (20 mm or greater). do you think I't's possible to develop a higher speed disc (10-11) with a smaller wing 18 mm or so? I'm guessing that the wider rim is necessary for high speed.
The wider wing is the easiest way. But, yes it is possible to develop an even faster disc with a smaller wing, but there are technical problems related to disc specifications and control.