I see you posted right before I did that you use LR 5.
Perhaps we could get a few people to offer suggestions on how they do Noise Reduction in LR 5. It might help.
For me I just zoom to a certain spot in LR 4 and adjust the sliders to get the best look. I balance it with sharpness as they tend to cancel each other out. I know there are more advanced methods.
I know there are others here who can give an advanced tutorial if asked.