Ive read that my cpu tends to run hot and that around 50C isnt too unusual. I dont know tho. The cooler is running at 1250-1300 rpms according to CAM software.
Are you referring to the pump or the fan? Try setting the pump to a static 100% rpm. When reseating, make sure that the cooler was tightened evenly in an X-pattern as opposed to one side before the other.