Setting parallax to (0,0) is generally used for something you want to stay in one position, such as HUDs.
Have you adjusted the x and y parameters of the parallax layer properties to say, 75 or 50, depending on what speed or effect you're after?
Sometimes you need to set 'Unbounded Scrolling' to yes to get the correct effect.
It may help you to just put your current project to one side for an hour, and just create a very simple .capx that just tries to get the effect you're after. At least then you could attach it to your post if you subsequently need help.