What kind of pan are you using?
I make measly 2 egg omelettes in my grandiose 10" cast iron skillet, but it's not nearly as convenient/effective as using a smaller nonstick skillet, maybe 5 to 6 inch (a smaller egg pan is basically the only thing I would consider using nonstick for)
Why does it turn to scrambles, is it sticking? Maybe you should use more butter/non-stick-spray-lol
Once the egg sets it should hold form pretty well.