We're also not mentioning one of the main things that's causing the roughness is the fact that at the end of the day you're still driving wood on cobble, the springs will help but without something malleable on the tires it's still not going to be pleasant.
I can see that since he's a tyrant that's solely powered on the progression of humanity, the serfs realizing that they have it better of with him in charge and wind up fighting for him. I mean, killing the corrupt nobles? A proletariat's wet dream.