I just went back to using Macromedia Flash 9 Professional, and I don't know why I stopped. It's much easier to use than Adobe Flash Professional, and is more simple. I can't edit things as easily, but it's easier to animate. I made a short test to see how it would look in longer animations: http://www.newgrounds.com/dump/item/644cbe907973a72f9aad748d86e897d7
Tell me if it looks smoother and more fluent.