Mine seems to like full stiff on both sway bars as well. I used 275 RE71R front and 315 Rival S rear last month. Then Switched to 275 RE71R F&R last Sunday. 275 RE71R all around was faster... 18x10.5 Front and rear.
This- any speculation to why it was faster? Very interesting.
Being able to retain and build more heat in the rear 275s might have contributed. Gotta keep the tire hot, but not too hot and over-saturate it.
Also in autocross it is imperative to build heat in the tires as quickly as possible since the runs are so short. A big cold tire will usually not perform as well as a smaller, warmed up tire.
