OUR OWN KEYBOARDS ARE CAUSING THE MICROSTUTTER!!
had mentioned in an earlier post, using a controller as opposed to K/B controls eliminated the microstutter. I have now confirmed this using my own controller and two different keyboards. Utilizing a keyboard for movement will definitely induce microstutter!
Why this happens is not yet clear, but without a doubt something in the last patch changed how the keyboard input interacts with the game. I won't speculate any further but we can now honestly say that we have nailed the cause down to user input devices.