You raise the link on the tower "lowering the roll center" and the car will roll more. Lower the link "raising the roll center" and it will resist rolling. I made sure mine had an even amount of roll front to back. Less roll in the back will oversteer more, less roll in the front will understeer more.

Strait from Hudy
A lower roll center will generally produce more grip
due to the chassis rolling, and the outer wheel “digging in” more

Makes sense to me?? Much harder to adjust on a real car also.
What gets cloudy in the hudy pdf is where it says raise the roll center on low traction tracks.