the second target bar over the enemy is under "display name settings" turn off engaged enemy hp bars. I'm not sure you can hide casting time but you can move it.

I did a UI customizing video and a PS3 opimization video that touches on some graphics that you speak of during battle... maybe those will help if you need visual reference.

http://www.youtube.com/watch?v=gXvz_REqljw
http://www.youtube.com/watch?v=wHhaJt4jIhk