Sway and jerking issues

Sounds like your on the right track on sway. Proper tongue weight and ball height. Sway control should only come into play with hard side winds and emergency braking. Not sure what you mean on the jerking problem. I'm guessing there is a lot of bounce on the hitch, delivering what is known as porposing. It usually becomes evident at expansion joints on concrete highways. If that's it, a lot of it is just the nature of the beast. It can be lessened with very good shocks and stiffening the rear suspension. I put StablLoads on the truck springs and Bilsteins Shock on my TV. I didn't eliminate the action but controlled it significantly