Okay I looked at some more of your shots. Your arm swing is completely all arm. You don't really have a push away, you pretty much just set the ball down and start your swing, or at least that is what it looks like from the video.
I'd suggest watching a video of PBIII. I know he's a lefty, but when he starts his swing, he gets the ball going and lets the ball do the work for his swing.
The goal is to be as loose and free as possible. I went and took a lesson once, and was told to make a circle while pushing the ball out. It didn't feel comfortable, but as I worked on it, it felt better.
It looks like you primarily have good balance, which is good, so don't change that. I just think you need more of a free swing, but I'm sure someone else can help you more.
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Ahhh Disco Biscuits!