<p>I know nothing about the D750, so I can't give specifics, but I do have some questions...<br>
Are you viewing the files as captured, or have you re-compressed them?<br>
Can you plug your camera directly into a TV and view the footage there? <br>
I never trust what I see on a computer. Too many variables like boggy processor, drive lag, image re-sampling and refresh rates... To me, playback on the computer is for reference only during editing until you have a final dump that has been properly compressed for the task at hand. I know what I got when I shot it, so I don't use the computer's representation to determine image quality of raw footage. At a minimum, use a real TV as a secondary monitor so that the scan rate of the footage (mind your 'p's and 'i's) matches what the display is trying to show you.<br>
Can you change the shutter speed but keep the frame rate at 25p? A slower shutter will give more motion blur and should reduce the jerkiness. Obviously there's a trade-off there that may require some experimenting, but in finding the balance of natural motion between too digital and too blurry, I wouldn't change from 25p if what you are looking for is a more film-like look.</p>