I just took a look at the project you uploaded. Apart from it being pretty messy because you used the demo project as a base instead of the scaffold or barebone project, I don't see anything wrong with it.
I think that it is just the human eye giving the illusion of blur. Try waving your hand back and forth quickly, it looks blurred too. The object on the screen is moving too fast for your eyes to see each step clearly.
I decided to clean up your project by rewriting it in the barebone sample. I hope that helps. http://cl.ly/1E0k1u3d3A3v3F120q0F
EDIT: The fps setting is in the AppDelegate. I tried it at 60 fps and it seemed a little smoother to me.