This is probably the most oscillation-free NG I have seen among all other videos, there is hardly any oscillation.
I am using the standard VANs nose gear but with the Matco axle which allows it to torque the nut without putting any pressure on the bearing and did a video of my own NS taxing up to 33k. The oscillation was more than what I see here but still much less than so other videos I have seen. So, I believe the key is a free rotating bearing with a well-balanced (round) tire. Mine unfortunately is not that that balanced or round.
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying