Those are pretty darn good as is. The grain isn't distracting at all. I remember shooting volleyball when I was in highschool (1999-2000) with 3200 ISO black and white film and the grain was like looking at a bowl of oatmeal.
One thing you may try is disabling your camera's built in noise reduction, and then using a separate noise reduction filter in post-processing. I've found with my Fuji X mirrorless cameras that the in-camera noise reduction causes a "smoothing" of textures, particularly skin tones, that is distracting and sometimes looks like fine-textured high-noise grain. Once I turned off the in-camera noise reduction that went away.
Last edited by Oregon45; 10/01/16.
