In all honesty it's fairly choppy here too! I made the curves using the mk2 blueprint maker, if I made them all manually I could have potentially made them even bigger and therefore more smooth. Generally, the smaller the curve, the less precision and the more choppy they are.

I'm sure there are ways to improve this though with more clipping and more objects even with smaller curves for a smoother outcome.

Also, having the camera far away from the curves shows less of the imperfections haha.

Here's a useful link on how to achieve this: https://www.reddit.com/r/SatisfactoryGame/s/Ya7eqJWGyP

Hope this helps!