The problem with the RAM not going to up to 2000Mhz might be that your motherboard is not specified as being compatible with the RAM. Only selected boards have been comfirmed of being able to run these fellas at 'full':
ASUS M4A89TD PRO
ASUS M4A89GTD PRO
ASUS M4A88TD-V EVO/USB3
*The Asus Crosshair Formula is also compatible, though it does not say so on the compatible motherboards list.
Sorry btw if im just stating the obvious to you though matey. I'm probably just being a .