How far away from the wall is the rad? It's hard to tell from the angel of the pics, put it looks like it's almost right against the wall. If it is, I would pull it away from the wall to at least have a 2" space between them for good air flow. My first wc setup I had the rad mounted on top of my case with only about 1/2" between the rad and top of the case. When I used 2" spacers to raise the rad off the case, my temps dropped a good bit.