Tail Animation Help

So I'm trying to make a smooth tail animation and I'm not having much luck. is there anyway to make it move fluidly without the labor of frame-by-frame? I'm using AS2, so so shape tweens or bone tool

Here's a demo of it, it's supper rough, all of the 'buttons' are just for testing (changing from day to night etc.) the tan button controls a crude talk animation and all the red buttons are different expressions. for the tail I did a simple classic tween, but it looks really stiff, if you hit the last purple round button at the bottom she will transition to angry and her tail will twitch, this was my bad attempt at frame-by-frame (one with no delay followed by the same animation with 5 frames between each key frame)

Any help would be awesome, or any other feed back about stuff looking bad is great too (this is my first time animating)

http://www.mediafire.com/download/51qlrddwliolivm/Spike_Talk_Model.swf